Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b1e9a99b728f9b…

MALICIOUS

PDF

39.9 KB Created: 2021-05-14 23:39:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dc1bab84d3c6ade9a2dd1ee35bacbde2 SHA-1: a3d16a56c69f7273978bed7a669e90b033f27114 SHA-256: d5b1e9a99b728f9ba9132bda345fb2865fc0fdb729bf015d9357e63689199252
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically advertising a 'free Robux safe game hack'. The document body and metadata indicate it was generated by wkhtmltopdf, and the presence of multiple redirector links suggests an attempt to lure users to a malicious site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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 https://netcdn.xyz/app/431946152/free-robux-safe-game-hack In PDF document text
    • https://collectrobuxIn 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
stream_003_off0000347c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x347C 31452 bytes
SHA-256: 7398053f581779d2d094ce42aa0cb52d22e14d35a636a36ee75ce750bb6c71f8
font_01_sfnt_off00007ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE3 18244 bytes
SHA-256: 393a0339ec2761f14ea9b29efa8c9c5fc9788b4979bd41a030a3ecef46023b5f

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