Malicious PDF — malware analysis report

Static analysis result for SHA-256 9563d64533323cad…

MALICIOUS

PDF

26.8 KB Created: 2021-06-26 00:13:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c282c5b286c3e1fa95ddceb43cfb4865 SHA-1: 48cde5bd0aca9a2d2e346a9d4de992e66117720f SHA-256: 9563d64533323cadee9ed80220bb38e8d8dfaf8f2df513ee2f504121092cb658
130 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating it links to a known malicious redirector infrastructure, specifically disguised as a 'free generator / game hack' for Roblox. The embedded URL, http://netcdn.co/app/431946152/reddit-roblox-hacks-game-hack, is the primary indicator of this malicious redirection. The document body also contains text related to Roblox hacks and a call-to-action, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0327

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/reddit-roblox-hacks-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_off0000166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166B 21168 bytes
SHA-256: 08ecfda0d97ab8fbbe29e1f2727ac2d4b919b43607123254186dbab2bb9d01fe
font_01_sfnt_off000044a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44A7 19052 bytes
SHA-256: 91a435e4704ca1ffbb6f76361c687cdc501ce0644a432a788b5b795cdaf63cbe

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