Report - fake apple app (with receipt of purchase)

Send the e-mail to Apple as an attachment to a new e-mail before deleting it. You can forward as an attachment by going to Mail/Message/Forward as attachment. Or control - click on the email and select Forward as attachment. Make sure you send it as an attachment to a new email. If you just forward it, it will probably be rejected. You won’t receive a response.

reportphishing@apple.com

You should never open any attachments, or click on any links, in spam messages.

If you receive a suspicious email in your iCloud email account, select the message preview so that it is highlighted. Choose Forward as Attachment from the Message menu (or right-click on it). Send the email to abuse@icloud.com. This provides Apple's legal department and law enforcement with useful information to help prevent future phishing emails. To read more, see the link below.

Recognize and avoid phishing messages, phony support calls, and other scams (Apple article):

http://support.apple.com/kb/HT4933