It can efficiently and accurately extract the permissions from an app. The static analysis method does not need to run the app. Term Frequency-Inverse Document Frequency (TF-IDF) is used to assess the importance of a word for a file set in a corpus. Permissions play a vital role in the security of the Android apps. Meanwhile, adopting more features will increase the complexity of the model and the computational cost of the system. However, due to improvements of malware itself and Android system, it is difficult to design a detection method that can efficiently and effectively detect malicious apps for a long time. The absence of third-party market regulation has prompted research institutions to propose different malware detection techniques. A large number of third-party Android application (app) markets have emerged. Android is the most widely used mobile operating system (OS).
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