Malicious PDF — malware analysis report

Static analysis result for SHA-256 d135c0fc8ce22062…

MALICIOUS

PDF

33.7 KB Created: 2021-07-19 07:45:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d9c07126f2021760c4f468e28a37656e SHA-1: 6b1194711ae2bfb6c4f0566227ac351115f157dc SHA-256: d135c0fc8ce22062675e1494f060a3976dcb99a2941cd8681f9d78a55f55ee78
180 Risk Score

Malware Insights

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

This PDF document contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The heuristic firings indicate a malformed exploit stream and malicious redirector links, strongly suggesting an attempt to lead the user to malicious websites. The ML classifier also flagged this document with high confidence. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 5

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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-website-game-hack In PDF document text
    • http://muckrossparkcollege.com/images/minecraft-mac-free_GM479516143.pdfIn PDF document text
    • http://muckrossparkcollege.com/images/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://muckrossparkcollege.com/images/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muckrossparkcollege.com/images/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://muckrossparkcollege.com/images/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://muckrossparkcollege.com/images/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • http://muckrossparkcollege.com/images/free-robux-link_GM431946152.pdfIn PDF document text
    • http://muckrossparkcollege.com/images/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://muckrossparkcollege.com/images/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://muckrossparkcollege.com/images/roblox-hack-generator_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_off00002cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CD5 22932 bytes
SHA-256: 65846585962d33502172258f9560b883bec1ac4a205939bca4a86352afacb80f
font_01_sfnt_off00006087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6087 18620 bytes
SHA-256: 1505002d6ea1bdfb5df8555ad3fb0955e96c48ae23d69b78f4b624628793cc75

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