Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7c990219ab7b2c…

MALICIOUS

PDF

50.8 KB Created: 2021-06-11 08:58:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-18
MD5: 01ad295dc49f5abb4b8b29b595cab184 SHA-1: 18714ef9492a2fa4da635809e2ca1c8e37740c28 SHA-256: cd7c990219ab7b2cf68ff285f2670f3498e4184f97185fa3e31b1c7d7e9279b4
220 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9779

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 https://netcdn.tw/app/431946152/free-robux-2021-june-game-hack In PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/hacking-the-condo-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-girl-hair-roblox_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-become-famous-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-parkour-hack-june-2021_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-obby-that-gives-you-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/roblox-how-to-get-free-money-in-jailbreak_GM431946152.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.kolejkrim.edu.my/repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005244.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5244 31904 bytes
SHA-256: 3236b392c92adfc102431ab9bc047991a90b1ce5c4fc6f3668a996b696455ef3
font_01_sfnt_off00009924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9924 2888 bytes
SHA-256: dcdd98ee8e25436a83587ccb4027347dd2c3fcec95f3413942edd4086125bcca
font_02_sfnt_off0000a2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2F7 18580 bytes
SHA-256: bf18cad46a87641fac3d83fee32c0fd7717dac3548059e0eb3289eba7680dd9e

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