Malicious PDF — malware analysis report

Static analysis result for SHA-256 23a6f75381ed8083…

MALICIOUS

PDF

41.8 KB Created: 2021-05-16 16:10:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a967220f5dd41b56e667a41e917e6dab SHA-1: a6abe07792ee72f70444fd6ec22364bb75e242c7 SHA-256: 23a6f75381ed80836683c3cc085a0595614441166f76697188831a64997a8565
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to sites offering free in-game currency or items. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent. The primary goal appears to be directing users to potentially malicious websites through a link farm.

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/free-spin-coin-master-game-game-hack
    • http://elearningman2jember.com/__statics/gudangsoal/files/free-robux-no-human-verification_GM431946152.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/coin-master-free-link-spin_GM406889139.pdf
    • https://elearningman2jember.com/__statics/gudangsoal/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdf
    • https://elearningman2jember.com/__statics/gudangsoal/files/rbx-hut-promo-codes_GM431946152.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/minecraft-realms-free_GM479516143.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/free-spins-for-coin-masters_GM406889139.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/coin-master-free-spins-link-quora_GM406889139.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/how-to-really-hack-coin-master_GM406889139.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/daily-free-spins-for-coin-master_GM406889139.pdf
    • https://elearningman2jember.com/__statics/gudangsoal/files/free-roblox-card_GM431946152.pdf
    • https://elearningman2jember.com/__statics/gudangsoal/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/how-to-get-free-robux-on-phone-2021_GM431946152.pdf
    • https://elearningman2jember.com/__statics/gudangsoal/files/how-to-get-to-village-3-in-coin-master_GM406889139.pdf
    • https://elearningman2jember.com/__statics/gudangsoal/files/can-you-give-me-free-robux_GM431946152.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/free-spins-coin-master-links-thursday-november-28-2021_GM406889139.pdf
    • https://elearningman2jember.com/__statics/gudangsoal/files/roblox-arsenal-hacks-download_GM431946152.pdf
    • http://elearningman2jember.com/__statics/gudangsoal/files/coin-master-apk-hack-3527_GM406889139.pdf
    • https://elearningman2jember.com/__statics/gudangsoal/files/free-spin-and-win-coin-master_GM406889139.pdf
    • https://elearningman2jember.com/__statics/gudangsoal/files/hack-coin-master-net_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049d9.bin
ce6b0f96a22bf7d3a8f663495608d3a7d9f747a3d3e778883876fcb5519b0af1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49D9 24732 bytes
font_01_sfnt_off00008194.bin
05f474a5dd778b1a8f82bb3f3194e0f6909204339d3dcef5442e6da61b36e890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8194 18148 bytes

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