Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd23c8469002dea1…

MALICIOUS

PDF

40.3 KB Created: 2021-05-11 22:06:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7bfec7fd43767e60e6651e02a08fdeac SHA-1: 7418ac9e032c8e52c877ccebc3ef9a6303e6be27 SHA-256: cd23c8469002dea10b8033fc12539a7a6fdf6ee7b6ba25d793a19d0652d4614b
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that lead to a known malicious redirector infrastructure, disguised as a 'free generator' or 'game hack' lure. The document body and metadata indicate it was generated by wkhtmltopdf, suggesting it might be a crafted document rather than a typical office macro-based threat. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or downloads.

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/431946152/free-robux-images-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_off0000338e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x338E 27456 bytes
SHA-256: 6447bee308a6743e4d665e03e6fe6c4a475fd267e5f7d01f8a5959e6a48a510b
font_01_sfnt_off00007106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7106 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00007ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB5 18792 bytes
SHA-256: a2580c58451f3b1d88c8ceab1016c43f7244c9e681afad5968b7c22bbe0132ae

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