I can't draw out a mechanism right now, so I'll give you some hints as to what's going on here instead.
SiCl4 is a weak Lewis acid, right? So what happens when you react a ketone with a Lewis acid? The product of this reaction, which reacts with itself, will help you see how the final compound comes together. Don't forget about that bromine on the benzene as well. It's an ortho/para-director, but deactivating.
Hope this helps! If you give this a shot and are still lost, I'll try to draw up a mechanism for you.