Malicious PDF — malware analysis report

Static analysis result for SHA-256 04026f77444e1af7…

MALICIOUS

PDF

45.8 KB Created: 2021-06-09 13:25:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c27aac333bbb5354fbf86b769f1fea98 SHA-1: d2846e9672463b38cfa9b1ba57fafcf28c200785 SHA-256: 04026f77444e1af785c345aa99f70a69aa7a2e64084016bcbbaa93ccd3c16552
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains a fake CAPTCHA lure, designed to trick users into executing malicious content or downloading further payloads. It also hosts a large number of external links, many of which are SEO-optimized PDF files, suggesting a link farm or content-spamming operation. The primary URLs point to download sites for games and in-game currency, likely as a pretext for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/roblox-game-for-windows-10-free-download-game-hack
    • https://tokunfome.com.br/images/link-for-free-spins-on-coin-master_GM406889139.pdf
    • https://tokunfome.com.br/images/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://tokunfome.com.br/images/coin-master-hack-tool-india_GM406889139.pdf
    • https://tokunfome.com.br/images/how-to-send-free-spins-on-coin-master_GM406889139.pdf
    • https://tokunfome.com.br/images/how-do-you-install-minecraft-for-free_GM479516143.pdf
    • https://tokunfome.com.br/images/free-tiktok-hearts_GM835599320.pdf
    • https://tokunfome.com.br/images/free-spins-on-coin-master-without-human-verification_GM406889139.pdf
    • https://tokunfome.com.br/images/free-robux-com-no-verification_GM431946152.pdf
    • https://tokunfome.com.br/images/free-robux-no-download_GM431946152.pdf
    • https://tokunfome.com.br/images/coin-master-apk_GM406889139.pdf
    • https://tokunfome.com.br/images/free-private-server-roblox_GM431946152.pdf
    • https://tokunfome.com.br/images/free-robux-redeem-codes_GM431946152.pdf
    • https://tokunfome.com.br/images/coin-master-free-spin-link-daily_GM406889139.pdf
    • https://tokunfome.com.br/images/google-how-do-you-get-robux_GM431946152.pdf
    • https://tokunfome.com.br/images/how-to-get-800-robux-for-free_GM431946152.pdf
    • https://tokunfome.com.br/images/play-minecraft-pocket-edition-for-free_GM479516143.pdf
    • https://tokunfome.com.br/images/free-roblox-apoc-servers_GM431946152.pdf
    • https://tokunfome.com.br/images/free-robux-codes-2021_GM431946152.pdf
    • https://tokunfome.com.br/images/free-cute-clothes-on-roblox_GM431946152.pdf
    • https://tokunfome.com.br/images/site-de-hack-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052ab.bin
c6c339dd4f19f7d0669c1a7c0373bfe401f25e4c16c8218cfe77b594cc283c96
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52AB 25204 bytes
font_01_sfnt_off00008cc5.bin
e62d1995213708204db5ce9a59b74c4ec04a087ddb57d6087a741fa4ecd2c46c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CC5 19540 bytes