Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61715543b8bf54c…

MALICIOUS

PDF

33.5 KB Created: 2021-06-25 14:13:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2caacd5515c78fe2c4c04737f65d0a7e SHA-1: 26047c6f74586c2c485cd6ed3ad92867bcee999a SHA-256: e61715543b8bf54c422c5e52ce1bba0f90a113ee2a277f8f66ed6ca2edbd3679
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure and multiple embedded URLs, including one pointing to a potential malware download site. The ML classifier also flagged this PDF as malicious with high confidence. The presence of numerous SEO-optimized PDF links suggests a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-nike-shirt-roblox-game-hack
    • http://muslib.unmus.ac.id//repository/roblox-studio-free-robux_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/how-to-make-free-robux_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • http://muslib.unmus.ac.id/repository/cool-free-halloween-costumes-roblox_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdf
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-app_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/i-cant-get-free-spins-coin-master_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/can-you-change-your-username-on-roblox-back-for-free_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/roblox-code-free-robux_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/www-robux-tv-free-robux_GM431946152.pdf
    • http://muslib.unmus.ac.id//repository/free-minecraft-windows-10-with-java_GM479516143.pdf
    • http://muslib.unmus.ac.id//repository/free-custom-minecraft-skins_GM479516143.pdf
    • http://muslib.unmus.ac.id/repository/coin-master-free-gifts_GM406889139.pdf
    • http://muslib.unmus.ac.id/repository/minecraft-online-free-no-download_GM479516143.pdf
    • http://muslib.unmus.ac.id/repository/free-minecraft-packs_GM479516143.pdf
    • http://muslib.unmus.ac.id//repository/robux-com-free-robux_GM431946152.pdf
    • http://muslib.unmus.ac.id/repository/androeed-ru-minecraft_GM479516143.pdf
    • http://muslib.unmus.ac.id//repository/coin-master-fun-hack_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
d83e825baf6babf233eedb3e946014e6fa2991cefbb8ed3e2a3dfd7f23ed20b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE2 21484 bytes
font_01_sfnt_off00005d9c.bin
a6482d001a35aa1c4ace3e02374a3a16761585abc8e4668b7e4fa95c61ce1566		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 19212 bytes

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