Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4ff7137b4903c5…

MALICIOUS

PDF

42.1 KB Created: 2021-05-15 00:30:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 192db11119d944cc28716ba27f6339bc SHA-1: 84a4e52adc3b8e8f3f767123513df7d73657e831 SHA-256: 5b4ff7137b4903c5b9bbd10847876b122e35022ad7cb83a09e5fe841992df8c2
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links to external websites, many of which are hosted on gamixpaliwa.pl and appear to be part of a link farm designed to distribute game-related cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading further content. No scripts were extracted, but the extensive link farm suggests a downloader or redirector pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/431946152/free-roblox-adopt-me-pets-game-hack
    • http://gamixpaliwa.pl/images/roblox-studio-free-robux_GM431946152.pdf
    • http://gamixpaliwa.pl/images/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://gamixpaliwa.pl/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://gamixpaliwa.pl/images/toolbox-apk_GM479516143.pdf
    • http://gamixpaliwa.pl/images/coin-master-free-spins-link-facebook_GM406889139.pdf
    • http://gamixpaliwa.pl/images/how-to-exploit-roblox_GM431946152.pdf
    • http://gamixpaliwa.pl/images/free-robux-place_GM431946152.pdf
    • http://gamixpaliwa.pl/images/coin-master-free-coins-hack_GM406889139.pdf
    • http://gamixpaliwa.pl/images/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdf
    • http://gamixpaliwa.pl/images/free-spin-coin-master-online_GM406889139.pdf
    • http://gamixpaliwa.pl/images/coin-master-332-apk-free-download_GM406889139.pdf
    • http://gamixpaliwa.pl/images/coin-master-free-spins-link-blogspot-today_GM406889139.pdf
    • http://gamixpaliwa.pl/images/coin-master-hack-spins-free_GM406889139.pdf
    • http://gamixpaliwa.pl/images/coin-master-cheat-engine-hack_GM406889139.pdf
    • http://gamixpaliwa.pl/images/free-spins-promo-code-for-coin-master_GM406889139.pdf
    • http://gamixpaliwa.pl/images/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • http://gamixpaliwa.pl/images/coin-master-daily-free-spins-link_GM406889139.pdf
    • http://gamixpaliwa.pl/images/free-robux-android_GM431946152.pdf
    • http://gamixpaliwa.pl/images/collect-free-spin-linms-coin-master_GM406889139.pdf
    • http://gamixpaliwa.pl/images/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000046f1.bin
dfec50fd57ba467b08a48af95613c847fb4274f2c276e0ffa5af33519ff1b993
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46F1 25184 bytes
font_01_sfnt_off000080ad.bin
52cfe92e200dfff1806eef07ab2f46449592264c572d29f9bbb977df1fa2ebc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x80AD 18752 bytes