Malicious PDF — malware analysis report

Static analysis result for SHA-256 944af29b24dad3a2…

MALICIOUS

PDF

34.3 KB Created: 2021-07-05 10:32:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2116aa86f2b1e0f0b96e2d75ae0c90a8 SHA-1: 8fd9a3e4667540c09edc2e10fae6fcf423d811e0 SHA-256: 944af29b24dad3a218f55d02f0f35c553326544b73907ec6f98c96af95cbe925
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/406889139/free-coin-master-spins-and-coins-game-hack. This redirector is likely used to deliver a secondary payload or phish for user credentials. The document body and heuristics indicate a lure for game-related cheats or currency, a common tactic for social engineering.

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/free-coin-master-spins-and-coins-game-hack In PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/animation-free-roblox_GM431946152.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/free-v-bucks-for-roblox_GM431946152.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/coin-master-home_GM406889139.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/roblox-reach-hack_GM431946152.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/free-robux-app_GM431946152.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/pokemon-go-free-dragonite_GM1094591345.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://lkp.cz/FRONTEND/IMG/PICTURES/files/roblox-blob-simolator-2-hack_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_off000031e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E8 22224 bytes
SHA-256: 0d7a33e696e94746cb2a4560027aafc34eae36a746c704891eea5b22c24b5e3f
font_01_sfnt_off0000633c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633C 18348 bytes
SHA-256: 413415c914cf3d685700639dfc58d8cf1fe3a335bb6d031630b58f909af9418a

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