Solution below working fine for me.
“My phone is not rooted but still infected by this malware. Apps are automatically installed on my phone without my permission..”
What I did is installing this two apps.
Adds on Detector
Stubborn Trojan Killer
And run it few time.
Based on my experience, unwanted new apps keep installed on your phone because your phone infected with Trojan apps ‘Android Systool’. This Trojan cannot be easily rid, it root deep on your phone system and working as a magnet to do illegal apps download on your phone. Seems the developer makes money from installing as many apps that sell advertisment as possible on victim phone.