Malicious PDF — malware analysis report

Static analysis result for SHA-256 7986bf9c1d64b4e9…

MALICIOUS

PDF

31.4 KB Created: 2021-07-19 07:08:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: bad29bbcc69c0d6b2e7a69b8dccb6173 SHA-1: 7f8ac43ab9f39f3691188bb11789aca5fefd81f2 SHA-256: 7986bf9c1d64b4e95f50a32d4d0984dc13d6dabf9d8d414733419f10a97894ec
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to a known malicious URL, masquerading as a 'free Robux generator' or 'game hack'. This lure is designed to trick users into visiting the malicious site, likely to download further malware or engage in credential harvesting. The document body and heuristics confirm the malicious redirector and the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0580

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-exe-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_off00002710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2710 22736 bytes
SHA-256: 9354b049fdbef1c2171735685af9442a9b1eda3ea61dbcf868fd4eec48b6b8cb
font_01_sfnt_off000059b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59B9 18200 bytes
SHA-256: 67527198e8f3e954f788e220fdc5e0efc04c24ca5928f64c044788dd6707c9fd

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