To install Hitman: Absolution on Android, the only "verified" method is to use official storefronts like the Google Play Store
APK (Android Package File) is a file format used to distribute and install Android apps. It contains all the necessary files and data for an app to run on an Android device. OBB (Opaque Binary Blob) is a file format used to store large amounts of data, such as game assets, that are required by an app.
: Requires approximately 12GB of free space for a full installation, though developers recommend having at least 24GB available for the installation process.