Original PNG file

First I tryed to search the binary data of the picture for strings. Doing so I noticed that there where two occurances of the string "IHDR" and "IEND". so as the title already suggests I came to the conclusion that the file actually contained two Images.
To see the second image i just deleted the first image from the binary data, wich revealed the flag.

Second image revealed after deleting the first one

The Flag was: hackover18{different_Fl4g_for_3arly_ch33tahz}