Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4eb1633c38e11a1…

MALICIOUS

PDF

44.2 KB Created: 2021-06-03 07:16:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 904163c9c0ab1203e35f6714a9bcb341 SHA-1: 377da9a8bf2826cc5097409c5c758b8c6f4523ba SHA-256: f4eb1633c38e11a15b1480181bd2231e9c7fb7e0a3da0c7e2a02a139235be5c0
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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.online/app/406889139/latest-free-spin-coin-master-daily-game-hack PDF link annotation
    • http://windhorsetrek.com/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/tiktok-free-download-for-iphone_GM835599320.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-tiktok-followers-and-likes_GM835599320.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-tokens-in-minecraft-ps4_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-minecraft-capes_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-free-login_GM431946152.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_004_off00005009.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5009 25324 bytes
SHA-256: 4edf64c5cd5f367595f964ada908b05a6c17f7ff3b6e1da7d1a3bc67032299ea
font_01_sfnt_off000089f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89F3 18308 bytes
SHA-256: 33b54ae1ad693c119f0cea53781b273ddfe293e057ee7515dcb4c42791ffe801

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