A mobile application penetration test examines an Android or iOS application, its behavior on the device and its communication with backend systems. Native, hybrid and cross-platform apps create distinct risks: attackers can analyze the application package, modify runtime behavior and access data processed locally or through interfaces.
What does a mobile application penetration test cover?
The application is more than its visible screens. A useful scope considers the app binary, local data, operating-system features, network communication, push messages, deep links, WebViews and the connected API. Update, signing and distribution mechanisms may also matter. The test should state exactly which app version, platforms and backend environments were examined.
Which areas are tested?
| Area | Examples |
|---|---|
| Local storage | Tokens, personal data, logs, backups, screenshots, Keychain and Android Keystore. |
| Communication | TLS, certificate validation, sensitive URL parameters and behavior under manipulated network traffic. |
| Platform | Permissions, exported components, clipboard, keyboard caches, deep links, IPC and WebViews. |
| Application logic | Login, sessions, tenant isolation, in-app purchases, offline functions and local security decisions. |
| Tamper resistance | Reverse engineering, debugging, hooking, root/jailbreak detection and embedded secrets. |
| Backend | Object and function authorization, token lifecycle, rate limits and business logic. |
Obfuscation, certificate pinning and root detection can slow analysis, but they are not dependable authorization boundaries. Attackers control their own devices. Critical decisions must therefore be enforced on the server.
How is the test conducted?
- Define platforms, builds, backend, accounts, devices and prohibited actions.
- Analyze the application package, manifest, resources, libraries and configuration statically.
- Run the app on real or suitable virtual devices and observe data flows.
- Carefully manipulate runtime behavior, local storage and platform boundaries.
- Test backend calls with different roles, tenants and objects.
- Demonstrate impact minimally, clean up and retest corrections.
Which inputs and access are needed?
Testable builds, accounts for different roles, information about test and production systems and incident contacts are needed. Source code, debug builds and architecture documents improve coverage in grey- or white-box engagements. For iOS, provisioning and device access should be agreed early. Synthetic test data should replace real personal and payment data.
Is an API test sufficient?
No. An API penetration test finds server-side authorization and logic flaws, but not unsafe app backups, deep links or locally stored tokens. Conversely, a client-only test remains incomplete if the API is not deliberately manipulated. A typical mobile engagement should plan both perspectives and state any overlap clearly.
What belongs in the report?
Each finding should identify platform, app version, prerequisite, reproducible steps, impact and a concrete remedy. Screenshots alone are insufficient for complex data flows. Good recommendations distinguish protection on the device from mandatory server-side controls. A retest covers the corrected app and, where applicable, the changed backend.
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