Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66a2ee243620a18…

MALICIOUS

PDF

39.4 KB Created: 2021-05-25 07:04:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 788ec2c100ec2ccc32846157b6d8a75f SHA-1: 4082f62d51493e1f0ead6990bbf238dd0d631d98 SHA-256: f66a2ee243620a18d6d1402c38194e1b1104d2c7d03ad32a59f9da70f0e004a8
130 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a lure for game hacks and redirects to known malicious infrastructure. The document body, though partially corrupted, contains text related to 'Free Robux' and a call to action. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0134

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-without-verification-2021-game-hack In 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_002_off00002dc6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DC6 27280 bytes
SHA-256: f0ab46ccb08270339bbf5569c9344d2e5e9a2256a8dc20f217f95c3a729f372a
font_01_sfnt_off00006bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF2 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000075a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A3 19368 bytes
SHA-256: a82984a519d7edf94c6531cfcf7f8df3cbe602e214b877051ae5dee029c294bf

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