Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a3cf4283b977b1…

MALICIOUS

PDF

39.2 KB Created: 2021-05-10 13:23:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3d63cb01ff85a1e544f186990e628acb SHA-1: c0279d75ecb877882a931cce04a2f8e0d90315c6 SHA-256: 41a3cf4283b977b12baeb711672cc8d04d246da8fea486fc8768622170869ebc
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirector lure, pointing to a known malicious URL. The document body also contains text related to 'Free Robux Thumbnail' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', reinforcing the lure. The embedded URL is the primary indicator of compromise, likely leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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-thumbnail-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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000366f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x366F 28132 bytes
SHA-256: 4389dce38d60315c5803bfa44ff46c021b4f4f468c96a9763b3be4726e45c587
font_01_sfnt_off000076cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76CF 18864 bytes
SHA-256: c969eb26f29950990ddccbf0eeab0a7af3119d1c9c7ebc0fee97903357bc58cd

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