Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ad1bf9422fab2c…

MALICIOUS

PDF

32.4 KB Created: 2021-07-21 12:34:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 61867d5b40625d11e8668cc823e887a3 SHA-1: 3bde08d24e36450783ec906ab1bf4a587016b98b SHA-256: d4ad1bf9422fab2cccf4c29bcaaa5b0723827b964a5f1974c49e3aaffc2a90ce
70 Risk Score

Malware Insights

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

The PDF document contains embedded text and a link promoting a "Funblox.xyz Free Robux" generator, along with a "CLICK HERE TO ACCESS ROBUX GENERATOR" call to action. A critical heuristic identified a PDF link to known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/funblox.xyz-free-robux-game-hack. This indicates the document is designed to trick users into visiting a malicious site, likely to deliver a payload or conduct further phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0622

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 http://netcdn.tw/app/431946152/funblox.xyz-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_off00002888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2888 23016 bytes
SHA-256: e5916dd30863fba55916eee2f51efb1c68f9448cebb452d220471cbd70d73813
font_01_sfnt_off00005c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C75 18604 bytes
SHA-256: 4f19dc3d0a3637c7e2dc0586789f2f07baab943710432e15838765b7ff05be1b

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