Malicious PDF — malware analysis report

Static analysis result for SHA-256 a06a4d6640677870…

MALICIOUS

PDF

48.0 KB Created: 2021-06-09 16:45:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 83c822062d2204d6735392ff5669254f SHA-1: 27329d585ce8ad86676d66725604b9514dae04be SHA-256: a06a4d6640677870855f42c2ee735ae4eee89b71f1bc9269fd6b207c59a16486
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 the document. It also hosts a large number of external links, many of which appear to be part of a link farm. The primary URL, https://netcdn.tw/app/431946152/passengers-in-free-roam-in-flight-simulator-roblox-wiki-game-hack, likely serves as a download or redirection point for a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/passengers-in-free-roam-in-flight-simulator-roblox-wiki-game-hack
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/my-ex-boyfriend-cheated-on-me-roblox_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-long-can-you-get-banned-for-hacking-in-roblox_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-ad-2021_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/cheat-engine-for-roblox-2021_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-do-i-get-free-robux-without-installing-apps_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-hack-roblox-free-robux_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-gift-card-codes_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/feburary-22-btools-hack-roblox_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-mm2-hacks_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/minecraft-pe-015-0-apk-free-download_GM479516143.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/fly-hack-dll-exploit-roblox_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/coin-master-free-daily-spins_GM406889139.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-hack-roblox-high-school_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-tiktok-followers-app_GM835599320.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-elemental-wars-hack_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-without-verifacation_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-roblox-card-codes-not-used-2021_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-give-code-away-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005804.bin
e55481b950be3c9adea3d2daa3b4c3e02a90d9a7ccc60a5c3b5329babf1c48cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5804 26300 bytes
font_01_sfnt_off00009528.bin
fe6630fc51fb92a147f8cfee97ce2b158a103edf0a1c5ce5d32a7c444bcaf061		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9528 19776 bytes

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