Why Its 7Sofa

 If you haven't seen "Scratch Murder Mystery episode 2" you better, because this article would have spoilers: 

When Birdah was walking outside on to the balcony, she was looking at the sky suddenly a hand touched birdah's shoulder Sterlon's oc has sticks hands so its not him. Also Phantom Animations has stick hands in this episode so, it could be 7sofa or Phantom because he changed his OC. But I think is mostly 7sofa.