Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6f9d9e737249cb…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 07:41:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 36a28184a64e8039a64e583d34c34361 SHA-1: 69da4066ee80282ea09f99416e28282a17aefb22 SHA-256: ac6f9d9e737249cbacb83355576cb33cdf3b8f772103acb66324573e5affcb89
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising free game hacks and gift codes. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which likely leads to a further stage of infection or phishing. No scripts were extracted from this sample.

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/479516143/free-minecraft-gift-codes-game-hack In PDF document text
    • https://dentmate.com.tw/image/data/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-cheats-how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/robux-hack_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-that-really-works-that-dont-need-human-verifacation_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/roblox-its-free-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/flip-master-free-coins_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/mechanique-car-simulator-hack-free-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-gamepasses-roblox-v3rm_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/cheat-indetectable-roblox-fantome_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/robux-hack-generator_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/unlimited-robux-hack-download-android_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/how-to-get-cloths-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/coin-master-unlimited-free-spins_GM406889139.pdfIn PDF document text
    • https://dentmate.com.tw/image/data/files/free-robux-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_off00003283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3283 22756 bytes
SHA-256: 20dec4a80f8d255e565576f795cf07620efed88914726719ead0d62692c41ff4
font_01_sfnt_off00006595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6595 18172 bytes
SHA-256: 74abe6c23d032b219b41aaf1211cfa33399b8dfd515ccc3a359dca2f936b7a04

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