Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f54b47ab5532b1c…

MALICIOUS

PDF

31.4 KB Created: 2021-07-20 12:10:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 2a56069393a6d9f61b0a1c64483a48bc SHA-1: ac4485445bddde2612c20ec7d1a450f86e6b0b2c SHA-256: 4f54b47ab5532b1c166aba2f4e4f54ffe82e7c95c6d6f562dafdc2c1ec10bc93
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for 'free Robux' and a prominent call-to-action button, directing users to a known malicious redirector URL. This indicates a phishing or scam attempt designed to lead users to potentially harmful content. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0580

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/get-free-robux-no-human-verification-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_off00002582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2582 22376 bytes
SHA-256: 81da07edbf1d8812b06924c09b6159589b926a33413c46cb324da81a965d6614
font_01_sfnt_off0000572e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x572E 19044 bytes
SHA-256: 38fd224e0d48f9f4e428ac61794e14445b5b8d4d7f08215596fa31319312d533