Is this check fradulent?

So I received a letter in the mail just now from Pinnacle Market Research 11645 South Street, Bronx, NY 10451 stating that they are looking for mystery shoppers. They want you to spend the enclosed $3,565.00 cashier’s check from PNC Bank on the following assignments. A $3,100 western Union transfer to someone in China, $300 is your pay for participating, $65 to cover the transfer fee and $100 to spend at J C Penny, K-Mart, Toysrus, Dillard’s etc. on anything you want. Has anyone come across a letter like this. Would you cash the check and follow the assignments?