Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee4860eae7d4729…

MALICIOUS

PDF

31.1 KB Created: 2021-07-20 13:42:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c0183ff0094953c1986874af2808ccc3 SHA-1: d72b87ef25ebf33c0007e14bcb0131a1ca480c14 SHA-256: 5ee4860eae7d4729138c48159042f35e576349d249e5b174d7439fe2659edcd3
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a redirector hosted on 'netcdn.tw', which is flagged as malicious and associated with a 'free Robux generator' lure. The document body explicitly mentions 'Free Robux' and provides a 'CLICK HERE TO ACCESS ROBUX GENERATOR' call to action, reinforcing the phishing pretext. While no scripts were directly extracted, the PDF structure and embedded links suggest it's designed to lead the user to a malicious website, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8800

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-game-hack In PDF document text
    • http://library.stikessuakainsan.ac.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stikessuakainsan.ac.id/repository/can-you-get-robux-for-free_GM431946152.pdfIn 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_off0000253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x253E 22612 bytes
SHA-256: b057223a6b35de67a8aaecdeda98eabe22bd91ca41371857709f960adf00a5ee
font_01_sfnt_off00005814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5814 18200 bytes
SHA-256: af0a6f01588019b38fd5688102a8ebe17e4b5155afa3360a762aee3dff872896

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