Malicious PDF — malware analysis report

Static analysis result for SHA-256 326f3ab0d93afe9b…

MALICIOUS

PDF

28.2 KB Created: 2021-07-06 14:36:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 24bd632bbd4e1af40f22d780fc772443 SHA-1: 29a3c5a992537ceb5985c74b667c207e0d8f20fd SHA-256: 326f3ab0d93afe9b4b0b8850e01c88ca245b73829ef0397a7a7f8f1038225410
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links pointing to a known malicious redirector, disguised as a 'free Robux generator' or 'game hack'. The document body explicitly contains a call-to-action phrase 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the lure. The primary purpose appears to be directing the user to malicious infrastructure for further exploitation.

Machine Learning

  • Nyx PDF Classifier clean score 0.0522

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/free-robux-without-downloading-apps-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_off00001603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603 22288 bytes
SHA-256: 291734f73163218f4f23d2c7ee15f3210408458e925c33866e46af6f1f4e0230
font_01_sfnt_off00004782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4782 20060 bytes
SHA-256: 8436a460c804c08fe10423d7ff888b310581b803afefa6e8463990a0aaecc0a2

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