Safari on my iphone 5 ios 7 keeps crashing?

First i jailbreaked my iphone after three days i downloaded a cracked version of safari download manger then i saw a video on youtube on how to get unlimited gems money and stuff on temple run 2 i didn't read the description or comments to see if other people tryed it and it worked so i did everything the guy did it and i had to download a file on safari and i downloaded but nothing happened so i turned off my phone then after a hour or so then i opened safari after 2 seconds it suddenly crashed or closed i tried again and again it won't open then i tried to close it on background or what ever its called then it showed safari it was the page opened when i downloaded the fake hack please help i can't do anything

Restore factory setting on your phone i.e format it. Then jailbreak it again, there might be some malware in your phone which is doing this.

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