Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d4f3ea80ff99a2…

MALICIOUS

PDF

42.3 KB Created: 2021-05-15 11:22:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e5bc740fdb8750763a92d44790bb9227 SHA-1: a0f1aa128f8118b69a5ac929b1dceb3717690743 SHA-256: e9d4f3ea80ff99a27922e86a39d60fe05c2d9d7f9a5a6744514c84f392724b0f
142 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to SEO-optimized PDF files hosted on potentially malicious domains. The presence of a fake CAPTCHA heuristic suggests the document is designed to trick users into interacting with these links. The primary URL, https://netcdn.xyz/app/406889139/2021-free-spins-on-coin-master-game-hack, is likely the initial lure, leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/2021-free-spins-on-coin-master-game-hack
    • http://shiny-nn.ru/images/gold-cards-coin-master-hack_GM406889139.pdf
    • http://shiny-nn.ru/images/robux-gainer_GM431946152.pdf
    • http://shiny-nn.ru/images/how-to-get-free-robux-hack_GM431946152.pdf
    • http://shiny-nn.ru/images/free-spin-coin-master-ios_GM406889139.pdf
    • http://shiny-nn.ru/images/coin-master-hack-version-33-2_GM406889139.pdf
    • http://shiny-nn.ru/images/how-to-hack-roblox-accounts_GM431946152.pdf
    • http://shiny-nn.ru/images/where-to-get-free-robux_GM431946152.pdf
    • http://shiny-nn.ru/images/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • http://shiny-nn.ru/images/free-robux-hack-no-human-verification_GM431946152.pdf
    • http://shiny-nn.ru/images/minecraft-wurst-client_GM479516143.pdf
    • http://shiny-nn.ru/images/coin-master-game-hack-link_GM406889139.pdf
    • http://shiny-nn.ru/images/coin-master-hack-spins-ios_GM406889139.pdf
    • http://shiny-nn.ru/images/free-coins-for-flip-master_GM406889139.pdf
    • http://shiny-nn.ru/images/can-i-get-robux-for-free_GM431946152.pdf
    • http://shiny-nn.ru/images/minecraft-realms-free_GM479516143.pdf
    • http://shiny-nn.ru/images/coin-master-2021-free-spins-link-2021_GM406889139.pdf
    • http://shiny-nn.ru/images/complete-offers-for-robux_GM431946152.pdf
    • http://shiny-nn.ru/images/free-robux-link_GM431946152.pdf
    • http://shiny-nn.ru/images/coin-master-link-daily-get-free-spins-amp_GM406889139.pdf
    • http://shiny-nn.ru/images/free-robux-generator-without-human-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004af1.bin
dacec5c8a568f897b67a4194127392081fee25e1c8a19ec19c585626cb64dc52
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF1 25224 bytes
font_01_sfnt_off00008305.bin
622f5559f42d42bdf895aa0dd0378bc93f6cb1528ecbdf5ac45ca29ab5b27cb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8305 18288 bytes