TrendMicro published an interesting post to explain how it is possible to hack RFID Payment Cards with Android App. The post focuses on the security risk of RFID payment cards in general. Experts suggest to customers to periodically check the balances of their accounts and take care of the type of cards they are currently using. The author of the app was able to interact with the card without being blocked by authentication mechanism, because the smartcards are based on an older implementation of the Mifare (MIFARE Classic)”]
Source: https://securityaffairs.co/wordpress/30486/hacking/hacking-rfid-payment-smart-cards-android-app.html