I don't think its high enough to get banned. Adsense doesn't only look at the CTR. Adsense considers many more aspects like : 1) How much time people are spending on your website on average 2) They record the IPs 3) They make sure someone isn't using a proxy to click on your ads 4) Is the advertiser getting any conversions? In most cases its the advertiser that complaints to google that he got spam traffic and lost all his money for nothing. So, then the adsense staff reviews the your website and ban you if they find anything suspicious.
its a normal CTR if you are not earning from adsens try google adsense alternative to get money more money from your wbesite / blog
why would adsense ban you for that CTR ? my ctr is even lower for some sites .i think a high ctr would be above 10% ,and a low one would be 1%