Malicious PDF — malware analysis report

Static analysis result for SHA-256 97a8caf8ad0d6719…

MALICIOUS

PDF

35.2 KB Created: 2021-05-15 16:41:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 55341315e2fcafb0f570fa966cf248e4 SHA-1: 421e545d5e658b9011ed8d497d4215d7d0aa5399 SHA-256: 97a8caf8ad0d6719afe86b79e796df5302b908a1ad37b490f058516cd6d924e7
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The embedded URL, https://netcdn.xyz/app/406889139/kachifpro-game-hack, is identified as malicious infrastructure. The document body also contains a call-to-action phrase, reinforcing the lure. While no scripts were extracted, the primary attack vector appears to be social engineering via a malicious link within the PDF.

Machine Learning

  • Nyx PDF Classifier clean score 0.0306

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.xyz/app/406889139/kachifpro-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_003_off000030ae.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30AE 24920 bytes
SHA-256: 8c0e3bd9b15a6f72a14f7ff9a1dcbb03b331b1ea7cbc25cc3e4cbbb7b36ef3ea
font_01_sfnt_off000069a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69A1 17784 bytes
SHA-256: f5f16e9fe06415f99f9f196ec79e922628d3dac9c37f6a7894d79eeb781dffd0

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