Malicious PDF — malware analysis report

Static analysis result for SHA-256 688b5842b855e480…

MALICIOUS

PDF

36.4 KB Created: 2021-05-10 11:06:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 41a12debc058a9e5f39492e51667934d SHA-1: ebe342cc8a4119b7d0dbf5f72c97f274d8502278 SHA-256: 688b5842b855e480267631a5a71c42b2f023ef6bef94ca8ad3df7afd96d4c5c4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'Coin Master Free Spin Now' lure. This link, https://netcdn.xyz/app/406889139/coin-master-free-spin-now-game-hack, is the primary IOC. The document's structure and embedded content suggest it is designed to trick users into clicking the malicious link, likely leading to further malware download or phishing.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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-spin-now-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_off0000357d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x357D 24480 bytes
SHA-256: 7b1d72b0cf6ba032c2ac232b91da856f7cb163d881f177a91d65d34f76e3365a
font_01_sfnt_off00006d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D92 18052 bytes
SHA-256: da185b0203ebc3949652e5967f83aecff7adc1a6faf65a4e6bfade67323ea1ff

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