Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a12846f1c971dc4…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 09:15:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f73a0751a4108efa399f4efe392e9217 SHA-1: 63511497a1b46d81a729adb90ac6b83e1f62ac6e SHA-256: 8a12846f1c971dc4b2c2f3014308a0e1db501d0677428fd895c8250c919334f0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free currency for popular games. The primary redirector URL is http://netcdn.tw/app/431946152/microsoft-robux-game-hack. This indicates a phishing or scam attempt designed to lure users to potentially harmful websites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a social engineering attack.

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/431946152/microsoft-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-code-for-roblox-december-2021-unicorn_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-golden-card-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-for-surveys_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-free-hack_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-tips_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-promo-code-generator-roblox-2021_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_off00002e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E5C 22340 bytes
SHA-256: 317b8e5caa2102b0fc1d4f896444e0a0f751da38f48c04f936d9739bf1bddb03
font_01_sfnt_off00006044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6044 18972 bytes
SHA-256: d6a3ce79aa63d991b5b8cdb75d9c3988d6b2b0452395129ae24b92a3de9ee2ba

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