Same happened to me in Berlin at Gendarmen Markt when I was sitting on the stairs. A group of romanian girls walk up to me with a petition. But i knew the trick. So i declined. But they keep pushing and distracting you. NEVER EVER sign, or never pull out money. They surround you with 4-5 people. So whatever you do, always back out and make sure nobody is behind you. keep your hands in your pocket and hold on to your phone and wallet in your pocket. Because they are good at spotting entry points to pickpocket.