Kali Linux has been published with Kali Nethunter, a version of the security suite for Android devices. The tool is a mobile distribution designed to compromise systems via USB when installed and run on an Android phone. Kali Linux NetHunter project provides much of the power to Nexus users, those running the NetHunter penetration testing platform can now launch attacks including Teensy keyboard via HID style attacks and BadUSB man-in-the-middle (MITM) networking attacks via USB human interface device (HID), wireless 802.11 frame injection.
Source: https://thehackernews.com/2014/09/kali-linux-nethunter-turn-your-android.html