Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd5fa249e7917f7…

MALICIOUS

PDF

30.4 KB Created: 2021-07-20 14:01:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f0c3468e52679cef701fd8717af5e2f2 SHA-1: 4a03347952cc3aa124a453229b3f75b82789bf7d SHA-256: bfd5fa249e7917f7a9152e11f33e2eb5fe166338d102d3f613c2ca5d27c1e5d2
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'Free Robux' and includes a link to a known malicious redirector. This suggests a phishing or scam attempt designed to lead users to potentially harmful websites. The document body and heuristics indicate a clear intent to trick users into clicking the malicious URL.

Machine Learning

  • Nyx PDF Classifier clean score 0.0573

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-no-human-verification-or-survey-or-download-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_off00001f11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F11 22140 bytes
SHA-256: 68dcceb4cfd7d6f6a4c87718451e0a6bd42ac893544c74567e0d7d30a5de5ce9
font_01_sfnt_off00005039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5039 19920 bytes
SHA-256: 318d114cafd7cea48f1a11f27c957389fae6c279952253c490b27c84185ff225

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