Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e20bfc95ad2e0b8…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 09:40:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9ca77f89687cde390dc3aab9dbe32695 SHA-1: 0e4063967668c3d7ddfd5312ee9eb47ebc4dfa23 SHA-256: 6e20bfc95ad2e0b86bbaaec1b06e50b06620f02f82778c87719b5693edc29a30
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are SEO-optimized PDFs designed to lure users with promises of free in-game currency or hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external links suggests a link farm or redirection to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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.tw/app/406889139/free-spin-coin-master-twitter-game-hack
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-no-verification-on-combuter_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/rbxcity-free-robux-instant-pay_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-mad-city-in-roblox_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/minecraft-rtx-download-free_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-btool-hack-ultmate_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-money-on-roblox-adopt-me_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-card-hack-apk_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-people-on-roblox-dontneed-to-install-anything_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-verification-or-survey_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/exploits-roblox-topkek-free_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-unlimited-free-robux-and-builders-club_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-coins-coin-master-hack_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/noclip-hacks-for-roblox_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/minecraft-mods-download-free_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-fun-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/roblox-rewards_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/5-games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/download-roblox-hack-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000345c.bin
03e466006a2c7d905809b44667f79d9cf06cb2e71bdcb2aaaafd75c835b63524		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x345C 22936 bytes
font_01_sfnt_off000067f3.bin
dbab6a80daafa71f1e061f75c0d82e12a0e9023e308b0b95e4f6d3b99741e995		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F3 18336 bytes

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