Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de1b0dbee072463…

MALICIOUS

PDF

46.1 KB Created: 2021-06-07 11:24:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c842b43afaead3b45ba0efacb68aa93c SHA-1: ed4741c9dee60753d817266df35b3ea8eac1b6a4 SHA-256: 6de1b0dbee072463abefd4d97a97700c9f591b94acd46dec4236ee7a4449f252
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a malicious lure, employing a fake CAPTCHA or human verification prompt to trick users into interacting with embedded links. The document contains a large number of external links, many of which point to SEO-optimized PDF files hosted on 'ths-academy.net', suggesting a link farm or content-scraping operation. The primary external URL, 'https://netcdn.tw/app/431946152/como-conseguir-el-egg-hunt-de-hacker-roblox-game-hack', likely serves as a landing page for the scam.

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/como-conseguir-el-egg-hunt-de-hacker-roblox-game-hack
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-get-any-packages-for-free-on-roblox_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-get-money-on-roblox-cheat_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/error-connecting-pipe-3-roblox-hacks_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-jojo-blox-hack-script_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-hack-tool-robux-and-tickets-download_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/minecraft-free-app_GM479516143.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-lumber-tycoon-2-how-to-get-free-money_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-get-free-spins-for-coin-master_GM406889139.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-free-robux-apps_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-promocode-that-gives-you-750-000-robux_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-no-download-or-survey_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-get-free-items-in-roblox-camping-game_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/minecraft-java-free_GM479516143.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-arsenal-hack-script-pastebin_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/robux-hack-generator-no-veriy-100_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/como-hackear-robux-en-roblox-con-cheat-engine-66_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-hack-someone-on-roblox-with-google-chrome_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-hack-mod-windows-7_GM431946152.pdf
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-hack-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005298.bin
4fdb16b0265d2b4d3733d7820c12ba9718a288da733a99f1b2c7c7dcc90b85f1		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5298 25828 bytes
font_01_sfnt_off00008ed9.bin
65869bc1dc351f19a7efea6198078f0af97354b23b51781c8c88ac308ab3d464		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ED9 19264 bytes

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