Malicious PDF — malware analysis report

Static analysis result for SHA-256 425df878d40a3e7a…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 19:39:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-15
MD5: e0f83e1d493a92e29bf50c329a254d6c SHA-1: 2b7134aca142a590ccb94d0fb0ee9dc91ed0c5cb SHA-256: 425df878d40a3e7a4e2984d898ef86d9ad5e9d3bfa4cf9a084c8236a8f96a889
220 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/gain-robux-game-hack In PDF document text
    • https://c2o-library.net/catalog/repository/roblox-cheat-engine-2021-download_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-free-robux-but-only-login_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-jailbreak-hack-keycard_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-make-your-on-roblox-hacking-client_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/find-the-code-and-get-400-million-free-robux_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-hack-to-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-put-hacks-in-roblox_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/how-to-get-stuff-that-cost-coins-free-mcpe-master_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-roblox-promo-codes-august-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/roblox-apk-hack-unlimited-robux-2021_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/robloxs-got-talent-cheat-tuto_GM431946152.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • https://c2o-library.net/catalog/repository/free-minecraft-capes-no-mods_GM479516143.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_off00002f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2B 22352 bytes
SHA-256: 4db7b513598f6d898c5a13431e9fa5fca675c4974e2bce2991ae56ffc165be0b
font_01_sfnt_off000060ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60AB 18672 bytes
SHA-256: c80488855d2dce79205e485caf841cdd4be57ea4b0e2695af8b913eb79d7bdb3

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