Malicious PDF — malware analysis report

Static analysis result for SHA-256 01972937309c3d13…

MALICIOUS

PDF

38.2 KB Created: 2021-06-09 17:13:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 05931ce0f15220ed5bc1cc7f1301c048 SHA-1: f24dfefbc89ff80dc6692112d3b23a890d451441 SHA-256: 01972937309c3d132d37e6c352edb6c7c7aa586e659b55ef6b06884467154d00
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The embedded URL, https://netcdn.tw/app/431946152/assassin-roblox-hack-2021-game-hack, is associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and the nature of the lure suggest an attempt to direct the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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 https://netcdn.tw/app/431946152/assassin-roblox-hack-2021-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
stream_004_off000037bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x37BB 25400 bytes
SHA-256: 41cc3c567d96f9c845712f5450e47d45635bbca5d6636fa9ab20eefe5e55cd78
font_01_sfnt_off0000720b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x720B 18704 bytes
SHA-256: fa057005388f2168a8e6cd10aadb242f5b4d65977fb79ee6ab985cdb02ed4d09

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