Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d237dd684ed9a92…

MALICIOUS

PDF

36.5 KB Created: 2021-05-11 20:08:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0fcb2a86b667b782e9bbb2cf6c464bda SHA-1: b647e935f8e406da5cdb76cecf957271e1c82065 SHA-256: 3d237dd684ed9a92b40ba9341984bf1527192667cacc6f787a027347cc547594
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The document body contains text such as 'Robux Converter' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', reinforcing the lure. The embedded URL leads to known malicious infrastructure, indicating an attempt to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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/robux-converter-game-hack In 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_003_off0000310d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x310D 26352 bytes
SHA-256: edc11aac8707b629000d4f9645473db4b54e54d19b386117e057b061d1dca8ec
font_01_sfnt_off00006dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEA 18068 bytes
SHA-256: 445b05a7d025cae97bc3d237a95317cdc5e9af3154d94cfe5f369ebdcdfa036d

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