Malicious PDF — malware analysis report

Static analysis result for SHA-256 584a17bfa489178b…

MALICIOUS

PDF

32.7 KB Created: 2021-07-19 08:11:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ad056c00952f95243a07ba83fb7aff5c SHA-1: f7ae35ba45408f4491ff48eb06b2daf831426805 SHA-256: 584a17bfa489178bc8c095e24077e587d4fa58eebbb76a46a68765f8306924fc
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 infrastructure at http://netcdn.tw/app/406889139/free-coin-master-spins-link-game-hack. The document body and heuristics indicate a lure for game-related "hacks" or "generators", suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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-link-game-hack In PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-free-robux_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/minecraft-redeem-code-free_GM479516143.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://waldkindergarten-abensberg.de/images/claim-free-spins-coin-master_GM406889139.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
stream_002_off00002a95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2A95 23012 bytes
SHA-256: 5b636e6ad37b6c7c5c2a9352ca9a856d427b72eed8293ae6954384366563ab77
font_01_sfnt_off00005e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E59 18056 bytes
SHA-256: 3a13f115a00b8b7b194300b8b076c3bf70984f89fe406390bc378e2507b22e35

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