Malicious PDF — malware analysis report

Static analysis result for SHA-256 232cf6a875b3e383…

MALICIOUS

PDF

42.5 KB Created: 2021-05-18 00:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ba1440bcb18f9dd8c6620c3ea81df30d SHA-1: 1b39a912d9cd121feab2263e509e7ad5a6550d91 SHA-256: 232cf6a875b3e383ed839bcd7e858f663649b241873854bcfc12e842b0b388cc
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to files related to game cheats and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-optimized links suggests a link farm designed to drive traffic to potentially harmful content. The document body, though partially corrupted, contains references to game mods and download URLs, reinforcing the lure tactic.

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/406889139/coin-master-mod-version-free-download-ios-game-hack
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-robux-fast_GM431946152.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/huskybuckscom-free-robux_GM431946152.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/free-spins-on-coin-master-hack_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/minecraft-logo-maker-free_GM479516143.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/how-to-get-free-shields-on-coin-master_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-hack-no-root_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/roblox-sued_GM431946152.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/legit-coin-master-hack-october-2021_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/minecraft-free-download-apk-softonic_GM479516143.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/how-do-you-get-free-robux_GM431946152.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/robux-generator-without-human-verification-2021_GM431946152.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/2021-free-spins-coin-master_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-hack-apk-2021-download_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/free-robux-no-email_GM431946152.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/minecraft-pe-free-download-android_GM479516143.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-free-spons-apk-2021_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/coin-master-reward-link_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/free-coin-master-spins-without-human-verification_GM406889139.pdf
    • http://htbrasil.net/ckfinder/userfiles/files/free-minecraft-severs_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004af5.bin
b40af9693763c1597573f920bc92bdd88d79d3f8973e87d34f68e9aaa8eec9c8
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF5 24572 bytes
font_01_sfnt_off00008348.bin
e21c1a46e414e08f32ecd5b141a565b40ef5ebf0a551a42677bec20a6ad54cab
pdf-font-stream PDF embedded font (sfnt) at offset 0x8348 18424 bytes