Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8b6e0182f80272e…

MALICIOUS

PDF

27.6 KB Created: 2021-07-20 20:10:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 706d2c1b3bd6eaa73220aef37ae89ce4 SHA-1: d2d208b4d2f6d6ea716ef127900bf42bd384eb5f SHA-256: b8b6e0182f80272e92f3e57c7e7dac47afe524c848e55f73fac5213f0a23922e
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for linking to a known malicious redirector, specifically advertising a 'free generator / game hack' for Minecraft. The embedded URL, http://netcdn.tw/app/479516143/minecraft-java-free-trial-game-hack, is identified as malicious. The document body also contains this URL and a call-to-action phrase, reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and heuristics strongly indicate a phishing attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0328

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-java-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_off00001ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED7 20732 bytes
SHA-256: 239a5e433936bb1095d5e3a4a3d70e504c40abf2bd0a89a65e545318ad61d00b
font_01_sfnt_off00004b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4C 17924 bytes
SHA-256: d296bfe87a6dc97e41f58611965175a9d8d851c6709ce0e2d245db43bc469752

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