Malicious PDF — malware analysis report

Static analysis result for SHA-256 894e63bd7e0e8197…

MALICIOUS

PDF

34.8 KB Created: 2021-05-21 08:53:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c63311b4cff56eca021cd58042d97d9c SHA-1: c61cde45e0d7135d9f0f498d6e6b10a460d52be2 SHA-256: 894e63bd7e0e81974a5f0514d8efb7c818cd5fed1cf88a76a5ee0c6169b2af19
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic indicating it links to a malicious redirector disguised as a game hack generator. The document body explicitly contains the malicious URL and a call to action. This suggests the primary purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0718

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/coin-master-free-spins-link-today-new-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_002_off00002d7c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D7C 23996 bytes
SHA-256: ef32ea89185e9e2de3f50b749470e5622ad2e85b2288c68fd2117d0bfdf8d42d
font_01_sfnt_off0000647a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647A 18976 bytes
SHA-256: 9ab4b87832590d82aec569b9c8693c2016d5d9151569e528de1ed13ad8a1cb2c

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