Malicious PDF — malware analysis report

Static analysis result for SHA-256 51234c689e02c010…

MALICIOUS

PDF

29.1 KB Created: 2021-07-22 09:31:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4c84a7b31f630dc0100e517d470ab735 SHA-1: 0a8589254c112d1a69096c81d475eef331c61cdd SHA-256: 51234c689e02c010938dca3e1af046ab5d839b04841a2ef5037b72f2456756b9
130 Risk Score

Malware Insights

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

The PDF document contains a prominent lure for a 'free Robux generator' and includes a link to a known malicious redirector. The document body text and heuristic firings indicate that the primary goal is to trick the user into visiting the malicious URL, likely to download further malware or engage in a scam. No scripts were extracted, but the presence of a malicious redirector suggests an attempt to exploit the user's trust.

Machine Learning

  • Nyx PDF Classifier clean score 0.0570

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 http://netcdn.tw/app/431946152/how-can-you-get-free-robux-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
font_00_sfnt_off00001c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C88 22416 bytes
SHA-256: 8f171c43317a7d3c412fcbe111724f195d3176e5449b8abeb466b79bef166c16
font_01_sfnt_off00004e5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5C 18860 bytes
SHA-256: 3add24dcf1475cac500c121069f698e62b0696d093573e8c97a80decf3f01ac7

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