Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd73bb9d59c787b…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 15:07:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f89c814c59ffc324477093016b49942b SHA-1: 173022ca453d63810a78260abb0e23b001d360cb SHA-256: 8cd73bb9d59c787ba5ddb3bc7167c052b9acf1edc7659aaed7f66c7c8db1a2d9
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which are structured as a link farm designed to attract users searching for game cheats and free in-game items. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure reinforces the deceptive nature of the document. The primary intent appears to be directing users to download further content, likely malicious, from the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://netcdn.tw/app/431946152/how-to-get-free-unlimited-robux-game-hack PDF link annotation
    • http://global-brand.net/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-coin-master-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-coins_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-tips_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/full-throttle-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/fireboat-dynamic-ship-simulator-free-roblox_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/tiktok-views-free_GM835599320.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://global-brand.net/userfiles/files/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn 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
font_00_sfnt_off00002ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FF1 22700 bytes
SHA-256: d528150baa96b05543bc14cd149f2437d74e3c86f41b372a73cb6412d6f12df2
font_01_sfnt_off00006315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6315 19612 bytes
SHA-256: 9f90138c9e24558c53d7d73a6f9335c7ab378dcf12bc1965008c03c765cdf622

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