Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a9d36c2a616c41…

MALICIOUS

PDF

28.7 KB Created: 2021-07-20 00:02:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6004e7fd95c5613e9a2cce946fc41dc0 SHA-1: 65a22e408488473d53d971010beb0978d81ff531 SHA-256: 49a9d36c2a616c414d682219f77cdfb5fb8fe545f8be290c129a52d4eab1e35a
130 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a lure for a "free generator / game hack" and links to known malicious redirector infrastructure. The embedded URL `http://netcdn.tw/app/431946152/get-free-robux-com-game-hack` is identified as malicious. Although no scripts were explicitly extracted, the nature of the PDF and its embedded links suggest an attempt to exploit vulnerabilities or trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0329

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-com-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_off00001cc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC2 22368 bytes
SHA-256: 8f737244b4e123e2a8dc0a7bf11e4e80a093fc2ff5318f1ad88116a79c528d33
font_01_sfnt_off00004db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB4 18564 bytes
SHA-256: 9d935b1154b83d43f057013f62af94fe83dfa333e293d70844f56b73c3d99288

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