Citi Merchant Services statements CTS Holdings, LLC emails with a zip attachment. The attachment is secured so that only an authorized recipient can open it. In order to view the attached PDF file, you need Adobe Acrobat Reader Version 8.0 or re-install if you have an older version. The Zip file is a Zip file with an exe file: Sha256 Hashes::a003f8cedb6b5657883347626c9274bbbb5425ab46054045279c92edb44da240 [1]”]
Source: http://sanesecurity.blogspot.com/2015/03/citi-merchant-services-statements-cts.html