Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc751d7db277e4ae…

MALICIOUS

PDF

30.6 KB Created: 2021-07-21 01:10:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5a77203a590b0c872a6c56c8526f53fe SHA-1: 558a2bf39bb0f57fdf668352384ddebf2095224d SHA-256: fc751d7db277e4ae2579bb14864b538a2e8cbc49f32d79830743213ba1f1175e
130 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it links to a malicious redirector disguised as a game hack or generator. The embedded URL, http://netcdn.tw/app/479516143/minecraft-realms-free-trial-game-hack, is the primary indicator of this malicious lure. While no scripts were extracted, the PDF structure and heuristics strongly suggest an attempt to trick the user into navigating to a malicious site, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier clean score 0.0486

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-realms-free-trial-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_off00002483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2483 23140 bytes
SHA-256: 29f2bd2a89a777bf5b0d044ef03e80321c3bf50280fe42f2ee0739f152708070
font_01_sfnt_off000057c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C5 17900 bytes
SHA-256: 5e9e7e4dd5050dedb25c4bef302629088f41d3cb5f82066cb4e6c0f6a9bca7dc

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