Malicious PDF — malware analysis report

Static analysis result for SHA-256 757ec2297771bd8e…

MALICIOUS

PDF

46.0 KB Created: 2021-06-07 08:37:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 912ac7e83c269680a952885c82d99ea4 SHA-1: 71800a3079b162adfd5e089dedaaaf91682b65b1 SHA-256: 757ec2297771bd8e87fb4d580326bb7d288e4497d50935b1288e0b815d4b1a33
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with embedded links. The document hosts a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or content-spamming operation. The primary URL, https://netcdn.tw/app/431946152/how-to-get-builders-club-for-free-roblox-game-hack, likely serves as a landing page for a malicious payload or phishing content.

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/how-to-get-builders-club-for-free-roblox-game-hack
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-get-roblox-credit-for-free_GM431946152.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/minecraft-realms-free-codes_GM479516143.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/free-robux-without-doing-anything_GM431946152.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/minecraft-ps4-free_GM479516143.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/minecraft-java-edition-code-free_GM479516143.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/april-1st-roblox-hack-face_GM431946152.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/minecraft-online-free-no-download_GM479516143.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/free-coins-and-spins-for-coin-master_GM406889139.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/get-free-tiktok-followers_GM835599320.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-earn-free-robux-quick_GM431946152.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/minecraft-mac-free_GM479516143.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/roblox-games-free_GM431946152.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-get-free-robux_GM431946152.pdf
    • https://www.intercraftgallery.com/uploaded_files/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052e6.bin
d382534862d88d5b2ece51ed3f1fdd20647a37bff7536a50b3dc899f858ece78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E6 27008 bytes
font_01_sfnt_off00009008.bin
5cfae3f457337dac9e17f93e9bebc8bdb64297c15ebe70ee1e3a636930d46add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9008 18652 bytes

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