Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91a972d44bbd34b…

MALICIOUS

PDF

42.5 KB Created: 2021-05-14 05:32:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: e28d93c64dea26861d98831bff6afcba SHA-1: 83f6914422fb25e37cc9c21a575e5016f9489265 SHA-256: a91a972d44bbd34b374644e9f7ce08c6056c8130758921ab62bde1ee1f7b8422
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack lure, directing users to a malicious redirector URL. The document body, though partially garbled, contains text related to 'Free Robux Games' and a generator, reinforcing the lure. The embedded URL is the primary indicator of malicious intent, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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/free-robux-games-that-actually-work-2021-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000032a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32A4 29888 bytes
SHA-256: 1025d6b3bb9963712948e3ad50cb4c5d800bcf5608216cbc3657552bc6d45ff3
font_01_sfnt_off000076d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76D6 2820 bytes
SHA-256: 972979c3a46100cf5f8fd289bc6fbd2496ff75fec0e3f6753648c72ec6eba714
font_02_sfnt_off00008075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8075 19796 bytes
SHA-256: 825df7cf396e8d9c124972fb8483e304b72a256d7e3507e7d5ad5df48b88867f

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