Malicious PDF — malware analysis report

Static analysis result for SHA-256 6667b7b3f89e39a8…

MALICIOUS

PDF

36.2 KB Created: 2021-05-25 07:46:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 30dfaff592df0e9c83450645658eb21c SHA-1: d220b0b1744caf12cba2f9817ab610494aec270e SHA-256: 6667b7b3f89e39a8e063e73782d15ed097a2d9ac6b0eeb885a39bd040ee69618
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9508

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/835599320/get-free-tiktok-likes-game-hack PDF link annotation
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/www-free-robux_GM431946152.pdfIn PDF document text
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/krnl-download_GM431946152.pdfIn PDF document text
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-roebucks_GM431946152.pdfIn PDF document text
    • http://danginpurikauh.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-generator-com_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_002_off000030bc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30BC 27208 bytes
SHA-256: 2647b07330cf124bf8b55787ccd22842ff571ffe8ad98c766bf96d60d72e7a86
font_01_sfnt_off00006eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAF 17456 bytes
SHA-256: c397690cc80b7cdd5818f6212e28c5067632df1cbe38d70f20361ec61b14abd9

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