Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7aa42a7971236e…

MALICIOUS

PDF

34.0 KB Created: 2021-07-03 23:48:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a522e506c556d6f42f400127938d7fc0 SHA-1: 1c83352d3bb5cfb9a245a27ac68c106b14dc55b9 SHA-256: ac7aa42a7971236ea51c716ea62603de7abd08ac1655bb379fa64896bb0635cf
62 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a call-to-action phrase, strongly suggesting a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence. The primary lure appears to be offering free in-game currency or game downloads, directing users to download further malicious PDFs hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://netcdn.tw/app/406889139/coin-master-free-coins-and-spins-daily-game-hack
    • http://217.165.206.12/userfiles/files/master-free-spin_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/free-spins-coin-master-without-survey_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/coin-master-free-spins-fb-champion_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/free-pins-for-robux_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdf
    • http://217.165.206.12/userfiles/files/minecraft-for-chromebook-free_GM479516143.pdf
    • http://217.165.206.12/userfiles/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdf
    • http://217.165.206.12/userfiles/files/coin-master-free-spins-2-5-2021_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/coin-master-raid-hack_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/hacker-takes-over-roblox-streamers_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/coin-master-hack-mobile_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/free-robux-without-human-verification_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/coin-master-free-coins_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/free-spin-coin-master-twitter_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/games-like-coin-master-for-free_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/daily-free-spins-coin-master-app_GM406889139.pdf
    • http://217.165.206.12/userfiles/files/free-robux-no-downloading-apps_GM431946152.pdf
    • http://217.165.206.12/userfiles/files/minecraft-hack-download_GM479516143.pdf
    • http://217.165.206.12/userfiles/files/hack-coin-master-online-without-human-verification_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ee2.bin
ee1c9b9dbcfe854db0115729433f21cd69dc82e925458dc41c1c4c43d1e36c80
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE2 22380 bytes
font_01_sfnt_off000060c8.bin
9a55712549d24f40bd9168c897c03b6f38d3aaf5d93578d14a86cb5737851a0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x60C8 18772 bytes