Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4b2f03f3396b31…

MALICIOUS

PDF

35.9 KB Created: 2021-06-21 09:14:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9dee2c7e0b8b77ade6ad72388dfcbe23 SHA-1: 7926f8fb28bfeffcd088bc85eacdbdfaef329a84 SHA-256: fc4b2f03f3396b3172ee9e50797b99d22b58e950cd16b60eeb050482a856d1da
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.co/app/431946152/roblox-hack-script-twisted-murderer-game-hack PDF link annotation
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-activegamer_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-gift-card-pins_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/online-coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-no-download-or-survey_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/free-robux-videos_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/minecraft-pe-free-download_GM479516143.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/steves-roblox-hack_GM431946152.pdfIn PDF document text
    • http://kumotor.com.tw/upload/userfiles/files/daily-free-spins-on-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
stream_002_off00003189.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3189 23000 bytes
SHA-256: 6ff286b8c2a8c0a9c2ce6324f1a87886afef3905c60477b2deeb24f493020697
font_01_sfnt_off0000656e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656E 19728 bytes
SHA-256: 949943b5e699ae19d95e112d80b06f7a945dc0506bc1832316eeae1c5d7a19dc

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