Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d46cf7b3c6cfb8…

MALICIOUS

PDF

33.7 KB Created: 2021-07-06 03:39:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8076378667fc23e4041e9639ef670839 SHA-1: 4409b82680da24dd125fca6d7101682bb230e1ad SHA-256: e8d46cf7b3c6cfb89b4dca798ae9cbbf2af823adfc80db1206698dd3cfacdb02
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a call-to-action phrase, directing users to websites promising game hacks and free currency. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a large number of external links, suggesting a link farm or SEO poisoning tactic. The primary IOC is the domain 'netcdn.tw' which hosts a direct link to a 'robux-hack-game-hack'.

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/431946152/robux-hack-game-hack
    • http://pustaka1.unindra.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdf
    • http://pustaka1.unindra.id/repository/roblox-dragon-ball-mastered-script-hack_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/coin-master-hack-no-human-verification_GM406889139.pdf
    • http://pustaka1.unindra.id/repository/coin-master-free-cards-link_GM406889139.pdf
    • http://pustaka1.unindra.id/repository/minecraft-build-hacks_GM479516143.pdf
    • http://pustaka1.unindra.id/repository/www-roblox-com-robux-free_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdf
    • http://pustaka1.unindra.id/repository/who-to-hack-in-roblox-vampire-kingdom_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/minecraft-anarchy-server-no-hacks_GM479516143.pdf
    • http://pustaka1.unindra.id/repository/bux-life-free-robux_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/apps-for-free-robux_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/free-robux-without-human-verification-2021_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/how-to-get-a-lot-of-robux-for-free-2021_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/cheating-software-ro-b-roblox_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/why-is-tiktok-free_GM835599320.pdf
    • http://pustaka1.unindra.id/repository/how-to-get-free-robux-com_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/ways-to-get-free-robux-2021_GM431946152.pdf
    • http://pustaka1.unindra.id/repository/coin-master-hack-apk-ios_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e8e.bin
6bb26bebd592d2dcb498e79eb3044816a49938160463a47c84ae75b04d956289		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2E8E 22200 bytes
font_01_sfnt_off00005f88.bin
e8968fd2130dd0e19937d9907a0efa8c300424940f22b7ca5343d475ddd9ad09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F88 18724 bytes

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