Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbfff546c2bdaad5…

MALICIOUS

PDF

40.8 KB Created: 2021-04-23 08:18:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 41fba5a09dc49dad38d680d488a1b4d0 SHA-1: e8ac61abc4aac6797296da194df057b55e0dc7d5 SHA-256: cbfff546c2bdaad5da0c303470d088bcbc36716d24fa3e71dc00737025fb79e4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to 'free Robux' and links to external websites, indicating a phishing or malware distribution attempt. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' strongly suggests this, and the ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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://netsecure.pro/app/431946152/how-do-you-get-free-robux-2021-march-game-hack PDF link annotation
    • https://studentcareerinfo.com/images/drive-through-restaurant-tycoon-roblox-hack.pdfIn PDF document text
    • https://studentcareerinfo.com/images/roblox-the-northern-frontier-hacks.pdfIn PDF document text
    • https://studentcareerinfo.com/images/free-robux-generator-for-laptop.pdfIn PDF document text
    • https://studentcareerinfo.com/images/jentplays-how-to-get-free-robux.pdfIn PDF document text
    • https://studentcareerinfo.com/images/como-meter-hacks-a-roblox.pdfIn PDF document text
    • https://studentcareerinfo.com/images/robux-gratis-hack-para-ordenador.pdfIn PDF document text
    • https://studentcareerinfo.com/images/cheat-engine-in-roblox-jailbreak.pdfIn PDF document text
    • https://studentcareerinfo.com/images/mobile-roblox-hack-download.pdfIn PDF document text
    • https://studentcareerinfo.com/images/roblox-halloween-outfits-free.pdfIn PDF document text
    • https://studentcareerinfo.com/images/how-to-be-a-cheater-in-roblox.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003fe6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3FE6 24924 bytes
SHA-256: 406fc220da5771a506e2d15abeac777493ab6be0aa17c909b409c9af325abb62
font_01_sfnt_off000079a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 19604 bytes
SHA-256: 44230e36d0aec3dfd4271311383e0180b266de7dd6bafac01309083a3855a2ac

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