Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5547da335f0ae1…

MALICIOUS

PDF

29.7 KB Created: 2021-07-19 20:10:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 03cb90dbaf565330ac478435b8a45a8e SHA-1: d91e4dd14daa88c082ddd6199cefcccfcc4785e5 SHA-256: 4f5547da335f0ae1c9605f6b020a3c180f23d8d91d7d47c83b0cbbd4862ab416
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to malicious redirector infrastructure, specifically advertising a 'free generator / game hack'. The embedded URL 'http://netcdn.tw/app/479516143/minecraft-hack-mod-game-hack' is confirmed to be part of a malicious campaign. The document body also contains similar text and URLs, reinforcing the lure. While no scripts were explicitly extracted, the nature of the redirector suggests it likely leads to a payload download or exploit, hence the inclusion of T1059.007 and T1203.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

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/479516143/minecraft-hack-mod-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_off00002156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2156 22544 bytes
SHA-256: b80c605d9b2abbd3468aa28fcfa6935bed22050c47e3abbfd498a2e970ebaa10
font_01_sfnt_off0000534f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x534F 18056 bytes
SHA-256: c98163390533840513273057c02ab8b0002c23ddfc36b9b9583c7d176bc18763

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