Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d804cf050faf55…

MALICIOUS

PDF

29.9 KB Created: 2021-07-18 22:58:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3baef3785b5132bb5aab8aaeb1d0585e SHA-1: 7c06355500f5cdfbf641d3bf57893d1070f065be SHA-256: d2d804cf050faf55f679835faba507b4dc6c05ca16511bf10dd70d7575cb1ef6
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising a 'free Robux game hack'. The document body and metadata indicate it was generated by wkhtmltopdf, suggesting it's a crafted lure. The primary heuristic firings confirm the malicious redirector and the lure for a game hack, indicating an attempt to trick the user into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

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-do-u-get-free-robux-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_off000020f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20F1 22268 bytes
SHA-256: 8efc32f380033d8a1b55c8618a2934bf8e994f90a864ea0db2fdf8dadc58c771
font_01_sfnt_off00005259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5259 18636 bytes
SHA-256: ab6f51fdb1eed883fd21dff3bd0336e3a1b816e6c21a8924207bfe84ed9a007e

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