Malicious PDF — malware analysis report

Static analysis result for SHA-256 290fc9f1e3407253…

MALICIOUS

PDF

45.5 KB Created: 2021-06-10 12:43:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bee819795cd29f7875a0bc0892641734 SHA-1: a8af346220d3f141e1d32497d36cfb8d804f6c4f SHA-256: 290fc9f1e3407253c554002ef82bd1a6d77274aaa5d639fdd92db1e51a240319
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a fake CAPTCHA lure to deceive users into interacting with a malicious link. The document contains multiple embedded URLs, with the primary one being https://netcdn.tw/app/431946152/roblox-my-boyfriend-cheated-on-me-game-hack, which likely leads to a further stage of the attack. The use of a fake CAPTCHA is a common social engineering tactic to bypass user caution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/roblox-my-boyfriend-cheated-on-me-game-hack
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/oprewards-robux_GM431946152.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-tool-hack_GM406889139.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-coin-master-spins-2021_GM406889139.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/roblox-skins-boy-free_GM431946152.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-stuff-on-roblox_GM431946152.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-minecraft-skins-pc_GM479516143.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-daily-spins-from-coin-master_GM406889139.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/minecraft-free-computer-game_GM479516143.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/promo-code-free-robux_GM431946152.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/aternos-free-minecraft-server_GM479516143.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/free-robux-meme_GM431946152.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/100-free-spins-for-coin-master_GM406889139.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/rbx-hut-promo-codes_GM431946152.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-update-2021_GM406889139.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-free-link_GM406889139.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/roblox-free-asset_GM431946152.pdf
    • https://redaksi9.com/new/public/ckfinder/userfiles/files/coin-master-card-collection-link_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050fe.bin
ae7932e24ed4ee7a3f2da609b2dcfe4669fc9ad0fa43e3a9bef866e8fc78f640
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50FE 26660 bytes
font_01_sfnt_off00008d1e.bin
0afbc1d0674a4210b6c23fb7c2c67a61ab323818bb2ba2da845786ec6bd11bc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1E 18952 bytes