Malicious PDF — malware analysis report

Static analysis result for SHA-256 1738ae2c0ff59eae…

MALICIOUS

PDF

35.0 KB Created: 2021-06-19 12:29:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cea67666923e168ea2f69fe34f22986e SHA-1: 40068a8b99b5bcb48521b97f059097cdb0e2ce69 SHA-256: 1738ae2c0ff59eae5f6590616737076bcedb2fd16fc1300a0864c7b5a1667bb2
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a primary external URI, all pointing to sites offering game-related cheats and currency. The heuristic PDF_SEO_LINK_FARM indicates a large number of these links, suggesting a link farm designed to attract users searching for such content. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this PDF, indicating a high probability of malicious intent, likely to lead users to download malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-hacks-for-mad-city-game-hack
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/minecraft-java-edition-free-trial_GM479516143.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/free-robux-without-verify_GM431946152.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/free-executor-roblox_GM431946152.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/minecraft-dungeons-free_GM479516143.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/roblox-com-games-referrer-roblox-player_GM431946152.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/how-to-hack-coin-master-using-es-filer_GM406889139.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/no-human-verification-hack-for-coin-master_GM406889139.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/free-robux-generator-2021-no-survey_GM431946152.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/roblox-hack-on-computer_GM431946152.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/coin-master-hack-apk-link_GM406889139.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/free-spins-coin-master-links_GM406889139.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/coin-master-free-coins-2021_GM406889139.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/free-old-roblox-accounts_GM431946152.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/minecraft-java-edition-code-free_GM479516143.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://www.johnofrolleston.com/admin/ckfinder/userfiles/files/free-robux-no-verification-no-survey_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003159.bin
0fbcb1e6d4996d185eb9635acc937d6d38ee600e4ae95c31b76386355a9d4530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3159 22100 bytes
font_01_sfnt_off0000622d.bin
acb63b84a86759be1bde607ddd54b53b2c513865c531269ee8e75a1066c794bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622D 19596 bytes

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