Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff1663fc771d01b…

MALICIOUS

PDF

16.8 KB First seen: 2020-08-25
MD5: c9ff635f2eb7d7f3613f967a2740b00c SHA-1: 6396a42a28d8e9e0ee2fbff10cf999659513cb1c SHA-256: cff1663fc771d01b4c84a3a35ed3d7ff806cc0beb64171977b5158e79401326c
60 Risk Score

Machine Learning

  • Nyx PDF Classifier clean score 0.0245

Heuristics 1

  • CoolType Type 1 Multiple-Master font overflow — CVE-2010-1797 (jailbreakme) critical CVE likely CVE_2010_1797
    PDF embeds a Type 1 (PostScript) font that carries Multiple Master Blend keys (BlendDesignPositions/BlendAxisTypes/BlendDesignMap) together with an over-long clear-text overflow filler (a giant repeated-token array, a 1 KB+ contiguous junk token, or a 'blatantly invalid' self-label). Multiple Master is a deprecated Type 1 sub-format whose Blend handling drives a stack buffer overflow in the FreeType / Adobe CoolType font parser — the static shape of the 2010 'jailbreakme' PDF font 0-day (CVE-2010-1797), the /FontFile (Type 1) counterpart to the CVE-2010-2883 SING exploit. The malicious bytes live inside a FlateDecoded /FontFile, so JS, heap-spray and raw-byte rules never see them; rendering one glyph in the font forces the vulnerable parse.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off000003eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3EB 421128 bytes
SHA-256: 030402a261fc08b3c4f12789f2439037b07de4a09a17e905e149283fe26cdf08

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