Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9978ea8e06bb0d4…

MALICIOUS

PDF

36.4 KB Created: 2021-07-04 15:44:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-14
MD5: 672ac9ddeb65f75477c42ce9272404bf SHA-1: a22224e19b12f0298933a52a7aea1aad67294642 SHA-256: f9978ea8e06bb0d46474e01252182abec305f14f1bb3c3bcd3065bdd17570173
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.tw/app/406889139/coin-master-free-spins-today-daily-links-game-hack In PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-you-get-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-without-hacking-or-human-verification_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-hack-generator-2021-that-i-can-download_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/safe-mac-roblox-quto-clicker-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-cheat-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/elysian-roblox-hack-download_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-no-verify_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
font_00_sfnt_off0000341b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x341B 23640 bytes
SHA-256: 6129f0f6a0eb82538793c049a7ad3646e0479cc0d51d1ff215ee88ed490e0390
font_01_sfnt_off000069a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A1 18940 bytes
SHA-256: 74e1d82992a432109423c701e24adf08bd24e863db22c1b49c4282e3a69c5270

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