Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f9ade7f7b09150…

MALICIOUS

PDF

44.5 KB Created: 2021-06-02 12:41:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a8c5f5cb00615784e4502e23dbf945ca SHA-1: 067f21f83556d7af37ac021df5f2118d9b45acc7 SHA-256: f3f9ade7f7b091504e8f27d617e702a7e9a944d78b857b9d6c935e40fbbb2b05
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with it, a common tactic for social engineering. It contains multiple embedded URLs, one of which, 'https://netcdn.xyz/app/431946152/free-island-tribes-roblox-game-hack', is directly associated with the malicious classification. The presence of these lures and external links suggests an attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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/431946152/free-island-tribes-roblox-game-hack
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-buy-robux-for-free_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/comments-about-bloxcom-free-robux_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/play-free-roblox-escape-games_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-cheat-engine-bypass-2021_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-raindrop-hack_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-roblox-visors_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-free-robux_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-candy-20-roblox-hack_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-get-free-robux-without-verification_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/a-wolf-or-other-roblox-cheats_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/coin-master-free-soins_GM406889139.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-spins-for-coin-master-app_GM406889139.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-phantom-forces-free-money_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/how-to-hack-into-any-ones-account-roblox_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-fighting-roblox-game_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/download-minecraft-free-hiapphere_GM479516143.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/free-robux-exe_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-delta-hack_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/beyond-roblox-cheat-engine_GM431946152.pdf
    • https://taxandmore.nl/wp-content/uploads/fsqm-files/roblox-retail-tycoon-cheat-engine-download-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005092.bin
bf4223dbafc3db11e9ad9ea5417e6c269fa656c7dd586fc6769b4a46a1b3ad5a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5092 25460 bytes
font_01_sfnt_off00008b07.bin
e3d75295893bcaf9e73cb996a3d51ebc815618f4e3bd67e799cb752056a9c0a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B07 18472 bytes