Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae37eabffe04f10…

MALICIOUS

PDF

44.4 KB Created: 2021-05-10 23:33:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 3a866821ee7a06f58d3fa6f460771fd8 SHA-1: 8ea60a8e34e83eeaf73a0cbd234def7379365c46 SHA-256: 8ae37eabffe04f106506b6529639ffa770cecd1d2404ec3e17316ab8c9448a47
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and sites offering "free Robux" or game hacks, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lures suggest an attempt to direct users to potentially harmful content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/431946152/roblox-zone-free-robux-game-hack In PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-pe_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/getrobux-ninja_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/hack-coin-master-32-mod-apk_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • http://fobh.net/userfiles/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/coin-master-hack-blogspot_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/get-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/links-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://fobh.net/userfiles/files/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000045c7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x45C7 24692 bytes
SHA-256: 41aa63b01c33285c27f6a2804d1e83d57c553e7b0ab1dc6ab0a249554eb6d011
font_01_sfnt_off00007e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E8B 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00008b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B33 18180 bytes
SHA-256: fa0bfd9229dff732b79349aec0b82eb394b94074e398d1bd7575aad3963e16a1

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