another trash scam in market its based on spymax sorse code already dead also 2min silence for the people who invested for cypher trash rat.
Only possible method is adb to install and execute the payload silently but this requires more developement and work to work properly
PS: Now scammers got idea and will start selling 0day for android soon(basicially based on adb)
i have a silent install but it requires the device to have an app with "automatic updates" on google play.
and it doesn't work with regular .apk, you load it as a plugin so you need to write malware on top of those apps (there are thousands)