Malicious PDF — malware analysis report

Static analysis result for SHA-256 373fa37d63741408…

MALICIOUS

PDF

47.5 KB Created: 2021-06-04 05:21:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f3da71b710f2dcb53d1ef1175343cf05 SHA-1: 59385cc9761c1f6911ce69fba504ea341edd6985 SHA-256: 373fa37d637414089da57897d6f5f7757868bebf52b215cc6adcc6271016f422
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to websites that promise hacks for games like Coin Master and Robux. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of many external links suggests a phishing or scam attempt, likely leading to further malicious content or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.online/app/406889139/earn-free-spins-coin-master-game-hack
    • http://digilib-unirow.ac.id/repository/codes-to-get-free-robux_GM431946152.pdf
    • http://digilib-unirow.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/coin-master-hack-xyz_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/fake-robux-codes_GM431946152.pdf
    • http://digilib-unirow.ac.id/repository/www-free-robux-com_GM431946152.pdf
    • http://digilib-unirow.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/how-do-you-get-robux_GM431946152.pdf
    • http://digilib-unirow.ac.id/repository/coin-master-hack-app-android-download_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdf
    • http://digilib-unirow.ac.id/repository/free-coin-master-hacks_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/coin-master-free_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/free-spins-on-coin-master-cheat_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/roblox-got-talent-piano-hack_GM431946152.pdf
    • http://digilib-unirow.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/coin-master-free-spin-codes_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/free-coin-coin-master_GM406889139.pdf
    • http://digilib-unirow.ac.id/repository/free-mods-for-minecraft-pe_GM479516143.pdf
    • http://digilib-unirow.ac.id/repository/how-many-levels-are-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ec5.bin
e7eea8b27b07e6a29a1f6dff77ade14f68900f725e5e04c25f2f0323994bc436		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EC5 30008 bytes
font_01_sfnt_off00008e32.bin
b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E32 2880 bytes
font_02_sfnt_off0000981d.bin
ab4497ad502ac8933d6a85a74dbdccf2fe2caf558913bb77e02944b83dc00fb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x981D 17884 bytes

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