Malicious PDF — malware analysis report

Static analysis result for SHA-256 142f216e3acc56c8…

MALICIOUS

PDF

31.7 KB Created: 2021-07-19 22:43:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 1d1b9ba3dd8304382de6fa4bbe75a619 SHA-1: 7971e5ff8a2fc0eecbf662939571fdf4036cd263 SHA-256: 142f216e3acc56c88d9cd0532b3daba57d01ca7c61e70601f9df1c7cc19b78f3
130 Risk Score

Malware Insights

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

The PDF file contains multiple heuristics indicating it's a malicious redirector lure, specifically targeting users interested in game hacks or free currency. The document body and embedded links promote a 'free Robux generator' which redirects to the malicious URL http://netcdn.tw/app/431946152/how-to-get-free-robux-without-paying-game-hack. This URL is flagged as part of known malicious redirector infrastructure, suggesting the primary purpose is to lead users to potentially harmful content or further malware downloads.

Machine Learning

  • Nyx PDF Classifier clean score 0.0621

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/how-to-get-free-robux-without-paying-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_off000024ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BA 22208 bytes
SHA-256: 24d81d8d73ee54fa8fd935195806beae576e99966f3a34278bfc1f22f8d9fcf6
font_01_sfnt_off00005605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5605 19800 bytes
SHA-256: 7a6bd967609fefc341f6a7ddde603ef8f20ee52d1249beb676f1778a37673d9e

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