Malicious PDF — malware analysis report

Static analysis result for SHA-256 805f74ff0e110f97…

MALICIOUS

PDF

30.6 KB Created: 2021-07-19 16:00:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aa8652586fcbf9f10f484317d15e630c SHA-1: ff2548a5295cf5298fd1718a462eefcb7a3b07ec SHA-256: 805f74ff0e110f9714c05addd1eeb17925284e04dee7fe50dff44424aeac5b56
130 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector infrastructure, masquerading as a "free generator / game hack". The document body and heuristics indicate a lure to trick users into clicking the malicious link, likely to download further malware or lead them to a phishing page. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0483

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-to-get-free-robux-on-computer-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_off000020fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20FE 22976 bytes
SHA-256: 66853fdb461f26b7e7b1738365eda268272176104ca2eceb4ba94f23d126e952
font_01_sfnt_off0000545a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x545A 18904 bytes
SHA-256: 45ab1b38094dcf93b5bcb7e9add098b6c863ed9ada52ace8b55ee9180603d92b

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