So I've been getting these weird, random text messages over the past few weeks and don't know how to stop them. It comes in as an MMS message of 2Kb. It won't let me download the images either. For whatever reason this message is spammed from people I know and random unknown numbers as well. Does anyone know what's going on?

(The images shows that whatever it is makes me receive the messages from my own contacts somehow)

ncG1vNJzZmien6fCrr%2BNmqWdqp%2BesaSxza2pmqRemLyue9OhqZ6ZlKh8uLHIq5tmrJWtwW65xKyqmp%2BVqHtyfJRxa3BxXw%3D%3D