Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f36421d2cc45188…

MALICIOUS

PDF

36.0 KB Created: 2021-05-23 08:14:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: fdf90dec7733e1a9bc95a435be52cff4 SHA-1: 8ec506d75e6d05f75a596a7c1997a84654adf4b8 SHA-256: 5f36421d2cc4518883ec7ed9a12b3086b5f5e6c91f9d0e991369b45c4c868d38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, masquerading as game hacks or free followers. The document body and heuristics indicate a lure to download further content, likely a second-stage payload. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick the user into executing downloaded files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

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/835599320/free-tiktok-followers-without-verification-game-hack In PDF document text
    • http://casabea.de/images/free-robux-script_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/worst-client_GM479516143.pdfIn PDF document text
    • http://casabea.de/images/free-robux-exe_GM431946152.pdfIn PDF document text
    • http://casabea.de/images/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://casabea.de/images/download-minecraft-free-hiapphere_GM479516143.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_off00003056.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3056 25036 bytes
SHA-256: d62d3e837b90c1cf86a92581eb88e9552c07e9322b628cf401fa3a50114176d1
font_01_sfnt_off00006a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A90 18560 bytes
SHA-256: 4328f2d9021fda272d6942102c30ad90396447c40598e55ae21b07e1aa723a10

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