Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f897ab38a71cfa…

MALICIOUS

PDF

38.7 KB Created: 2021-05-14 22:01:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c6c7a6e7763358d3c32c608bcee5f15a SHA-1: 0c11cd527998c2529b8f1abc408e793cf1712b78 SHA-256: 64f897ab38a71cfa4f2f6b881c53f9b73af7c387ab23cef71d8e64177cd129a3
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, specifically advertising a "free coins coin master hack". The heuristic firings indicate that these links are part of a known malicious redirector pattern. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt designed to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/free-coins-coin-master-hack-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003363.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3363 24952 bytes
SHA-256: 6fea887542faeffbcf2f87dc79fca8e74d9117a742cd206980e8c67f6f0a75ff
font_01_sfnt_off00006d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7A 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000772c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x772C 17880 bytes
SHA-256: d4b290fbe96f806a63e53895600235ad07ee700a50234ed47d5e5eeda0b1e0de

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