Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa3c2b860a4b3d1…

MALICIOUS

PDF

44.9 KB Created: 2021-06-07 04:09:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a31665fed0ab41457b18713c50c435b4 SHA-1: 681fca0a08d2f34456dd0e43ed4e1b1a258f6310 SHA-256: 2fa3c2b860a4b3d16bae57f0d15e08d69383cffac8c2b82cf04cbb7c39f22294
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document presents a fake CAPTCHA or human verification prompt to trick the user into interacting with it. It contains an embedded URI pointing to a URL that likely hosts a malicious payload. The document body and extracted URLs suggest a lure related to game cheats or free currency, a common tactic for distributing malware.

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.tw/app/431946152/crazy-robux-free-robux-game-hack
    • https://duoledesign.com/image/data/files/roblox-free-clothes-hack_GM431946152.pdf
    • https://duoledesign.com/image/data/files/earn-free-robux-today_GM431946152.pdf
    • https://duoledesign.com/image/data/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • https://duoledesign.com/image/data/files/coin-master-free-spin-group_GM406889139.pdf
    • https://duoledesign.com/image/data/files/robux-gift-card-free_GM431946152.pdf
    • https://duoledesign.com/image/data/files/2021-free-spins-coin-master_GM406889139.pdf
    • https://duoledesign.com/image/data/files/como-hackear-coin-master-espaol_GM406889139.pdf
    • https://duoledesign.com/image/data/files/get-free-robux-generator_GM431946152.pdf
    • https://duoledesign.com/image/data/files/pubg-uc-carding-in-pakistan_GM1330123889.pdf
    • https://duoledesign.com/image/data/files/free-spins-coin-master-2021-glitch_GM406889139.pdf
    • https://duoledesign.com/image/data/files/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdf
    • https://duoledesign.com/image/data/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • https://duoledesign.com/image/data/files/can-i-get-free-robux_GM431946152.pdf
    • https://duoledesign.com/image/data/files/free-links-for-coin-master_GM406889139.pdf
    • https://duoledesign.com/image/data/files/coin-master-spins-for-free_GM406889139.pdf
    • https://duoledesign.com/image/data/files/tiktok-free-credit-card_GM835599320.pdf
    • https://duoledesign.com/image/data/files/robux-withdraw_GM431946152.pdf
    • https://duoledesign.com/image/data/files/roblox-hack-game_GM431946152.pdf
    • https://duoledesign.com/image/data/files/free-robux-com_GM431946152.pdf
    • https://duoledesign.com/image/data/files/coin-master-free-2021-spin-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e98.bin
416a206e87d9c959f36a14e575d49719151ead8dfb52c9563324af56887a7438		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E98 26352 bytes
font_01_sfnt_off00008c30.bin
5ec3bfb50d80ec304afe2dd7d637ca01d5e196218ac2a89ec35f1bb4807df0b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C30 18504 bytes

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