Malicious PDF — malware analysis report

Static analysis result for SHA-256 657a5d082fa34604…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 21:41:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e9f7ce93e8edf458762ec25e01aafc84 SHA-1: 10e97857e202c51ed7c084696115931268ce8cab SHA-256: 657a5d082fa34604f5f0838049acff5e87d0cd90f9062f96e9bfaddac312401b
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 0.9980

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 http://netcdn.tw/app/431946152/free-robux-com-no-verification-game-hack PDF link annotation
    • http://windhorsetrek.com/userfiles/files/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/good-roblox-games-about-cities-for-free_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-roblox-card_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-free-clothes-generator_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-hack-roblox-booga-booga-on-mac-2021_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/mcpe-com_GM479516143.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/fight-the-monsters-roblox-hack_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/rbx-com_GM431946152.pdfIn PDF document text
    • http://windhorsetrek.com/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.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
font_00_sfnt_off00003134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3134 21568 bytes
SHA-256: 985da347854df0b9fb4a12920d09da263316626c29816e08b71323f3f07dc5d6
font_01_sfnt_off00006060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6060 19336 bytes
SHA-256: c813de002ff3dbe8c0a3897963b9aec5f795785f2e6b2d861bbfa4c347d96c2a

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