Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd72da8331c5810d…

MALICIOUS

PDF

35.0 KB Created: 2021-06-19 16:26:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-19
MD5: 97bf43e96d3d823e87d935f9cfbbb036 SHA-1: 6c2bc72b9b7f88b88d49c5a59b1350765e2b3d78 SHA-256: cd72da8331c5810dd72756142dab33cfc1679929c34309a314854a1c18c8085f
160 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/free-roblox-templates-game-hack In PDF document text
    • https://www.cow-style.com.tw/upload/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/dominus-roblox-free-hat_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-blogspot_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/robloxhacks_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/hack-de-free-drive-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/fbchampion-com_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/claim-free-robux-button_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-many-levels-does-coin-master-have_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_off0000302d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x302D 22924 bytes
SHA-256: 6c31b46390ab2b05a68dfa6872f68c524ce8f33bd1d069a5b5b59fa72d614288
font_01_sfnt_off0000636a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 19188 bytes
SHA-256: 60804325b4b1ce91878f14603998b6c01265d5cbae0abd130df38de24cd9d06c

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