Malicious PDF — malware analysis report

Static analysis result for SHA-256 81cbf3184303e99f…

MALICIOUS

PDF

16.0 KB Created: 2021-07-04 06:27:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 548ba2e8d91d7db8371625ba0852d7eb SHA-1: 3ad63364592b72446db637f54d0fa00afd626443 SHA-256: 81cbf3184303e99fad58e9a140cca1a6c6a1483edb73df6f4d837b39a0a08288
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically designed to lure users with promises of game hacks and free in-game currency. The primary redirector URL is http://netcdn.tw/app/406889139/free-spins-coin-master-links-blogger-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at driving traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 3

  • 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.
  • 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-spins-coin-master-links-blogger-game-hack In PDF document text
    • https://yeushuen.com.tw/image/data/files/hack-the-coin-master-game_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-jailbreak-hack-pay_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-hack-roblox-using-lucky-patcher_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-2021_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-spins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-obby-2021_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-put-e-free-o-roblox_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-link-today-ios_GM406889139.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-cool-boy-hair-roblox_GM431946152.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://yeushuen.com.tw/image/data/files/free-robux-inago-goay_GM431946152.pdfIn PDF document text

Related samples 7

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