Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b4c41d67607bc4…

MALICIOUS

PDF

41.8 KB Created: 2021-06-07 04:12:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a80019e67a9fe1b7d0ac29bfabe31a35 SHA-1: db6a935dc2d7a819f0781ec550dab6ec14c8be90 SHA-256: b9b4c41d67607bc4750e776ecd8ecf0892a97b06fd91abd930d408db8800b01b
70 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link pointing to a URL associated with 'free robux game hack'. The document body also contains text related to 'Robux' and 'generator', further supporting a scam or lure. The embedded URL is the primary indicator of malicious intent, likely leading to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0286

Heuristics 3

  • 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 https://netcdn.tw/app/431946152/free.comree-robux-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A92 26536 bytes
SHA-256: 6c106928144ab60131c6579286efd1141ad71ed1614efb8fb23633ce989901e6
font_01_sfnt_off00007765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7765 2920 bytes
SHA-256: 44788e4cedabc7e030d7cef5410c7f71146b1d44f4d1eb58a5000d3755917c6b
font_02_sfnt_off0000817b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817B 18340 bytes
SHA-256: b9d6601d5d139813f12e2aeb1e1695652e193bcc3b343761bc21875242a848f9

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