谘詢用Social Security check 買車

我在賣一輛車，有人寫email給我，我不太懂這個Social Security check .

I have a Social Security
check and am about to get an alimony check from my ex. I will assign my
Social Security benefits to buy your car. This a guaranteed payment from
the government so it's very safe.

My credit rating, before my stroke, was 746, average but medical costs
have hit me very hard.

對於這封信有些懷疑。請幫我看看。thank you!