Malicious PDF — malware analysis report

Static analysis result for SHA-256 c052dbbda27b6b63…

MALICIOUS

PDF

27.3 KB Created: 2021-07-02 02:42:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 0e16e2acc4c4003ba47f494a04347461 SHA-1: 750c49dcf4aaad6755448cf7972b7676bc5287cd SHA-256: c052dbbda27b6b63be408f92e862b861ec382367c3cedb7826b313cf2373e824
130 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a redirector lure, specifically linking to a 'free generator / game hack' page. This URL is also flagged as malicious infrastructure. The document body reinforces this by containing phrases like 'Free Promo Codes For Roblox 2021' and 'CLICK HERE TO ACCESS ROBUX GENERATOR', indicating a social engineering attempt to trick users into clicking the malicious link. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier clean score 0.0328

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.co/app/431946152/free-promo-codes-for-roblox-2021-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_off00001497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1497 22000 bytes
SHA-256: 10aa13c7c14d8b25ac7dfaf68389474687d64e67123b211c7177204c6cf6b935
font_01_sfnt_off0000454f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x454F 19640 bytes
SHA-256: 563683e195a0f9c5774dff93a1ee8ffa5b9fae5e1b7336e1c9c22065f2ab4a19

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