Malicious PDF — malware analysis report

Static analysis result for SHA-256 1774a25d8ffbfc1f…

MALICIOUS

PDF

45.3 KB Created: 2021-06-08 16:23:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0e2049d107d388fb923905ddad18ec60 SHA-1: 1cec48a5a0def65a0088006f6fbd2a0c471f8116 SHA-256: 1774a25d8ffbfc1f44ad5903f4a75529b83aef8f9bbff230129e18e259dcd3f6
82 Risk Score

Malware Insights

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

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt to trick the user into clicking a link. This link, 'https://netcdn.tw/app/431946152/how-to-use-winrar-for-hacks-roblox-game-hack', likely leads to a malicious download or further compromise. The ML classifier also flagged this PDF as malicious with high confidence.

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/how-to-use-winrar-for-hacks-roblox-game-hack
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/5-roblox-games-that-give-you-free-robux-working_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/gues-that-song-roblox-cheat_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-get-free-robux-for-kids_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/innovation-hack-roblox_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-free-robux-2021_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/acually-working-robux-hack_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-enter-a-cheats-code-in-roblox_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/how-to-get-free-coins-on-tiktok_GM835599320.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-unlimited-robux-no-survey_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/hack-roblox-volar_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/roblox-free-robux-hack-com_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/roblox-account-stealer-hack_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/roblox-fre-fsp_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/minecraft-account-hacked_GM479516143.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/hack-roblox-ccount_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/vibe-train-roblox-hack_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/f3x-hacking-roblox_GM431946152.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-spins-and-coins-coin-master_GM406889139.pdf
    • https://srmap.edu.in/wp-content/uploads/fsqm-files/free-tiktok-accounts_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005298.bin
c4445e053d76a1614799798ee7c8444659dbc7880800701597658189db24103f
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5298 24984 bytes
font_01_sfnt_off00008c40.bin
8ae0c4b14a2aa766a04d604ab19135be23ae07e7e6a52d2386d500a414509973
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C40 19012 bytes