Malicious PDF — malware analysis report

Static analysis result for SHA-256 3733d13bbd506d2a…

MALICIOUS

PDF

28.4 KB Created: 2021-07-19 06:45:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 6391225f68283c47a5e8cf370971e645 SHA-1: ac2d5b67a93a459c684f26af802d207d679134d7 SHA-256: 3733d13bbd506d2a3bd20613cc0cb135dcfb692c30eb4751363df5ca6d527c18
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 prominent call-to-action button, both directing the user to click a link for a "free Robux generator". This link, http://netcdn.tw/app/431946152/robux-match.com-free-robux-game-hack, is flagged as malicious and leads to redirector infrastructure. The document's structure and content strongly suggest a phishing or scam attempt, likely intended to deliver a secondary payload or lead the user to a credential harvesting site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0329

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/robux-match.com-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_off00001d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D94 21012 bytes
SHA-256: fa487ff7ddb46f5420f1e6c40baad9b3866c986d783a11aa3a01c17838070962
font_01_sfnt_off00004af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF9 19092 bytes
SHA-256: 13625695963a426473cdec0e2122eae6fd4ea6201280efa968dfc6869c64504c

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