Malicious PDF — malware analysis report

Static analysis result for SHA-256 267d8bca6a6e5090…

MALICIOUS

PDF

36.5 KB Created: 2021-05-13 02:00:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ecf215fec1723596e0caee884b91cd84 SHA-1: 669150214aec83fb2f6a735898e54f622fcf6424 SHA-256: 267d8bca6a6e50904a589493d157b4792f39a5cfc7b7a19ba061f030d6659e60
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links pointing to known malicious redirector infrastructure, specifically advertising 'free Robux' or 'game hacks'. The embedded URL 'https://netcdn.xyz/app/431946152/free-robux-link-game-hack' is identified as a malicious redirector. The document body, though partially garbled, also contains references to this URL and appears to be a lure for potentially unwanted or malicious content. No scripts were extracted, but the presence of malicious links strongly suggests a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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-link-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_off000032ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32FF 25604 bytes
SHA-256: dabfa00523de2a252771fa10a4c271b0592dc85ad13e91dd5bcec870901d1bbc
font_01_sfnt_off00006d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D8F 18304 bytes
SHA-256: a4aae99c46e0a0f586669c3aecb8c0d6e5f23962dc49b2f1654f133382ac5317

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