Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bd2e164bb73489…

MALICIOUS

PDF

44.4 KB Created: 2021-06-09 07:13:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e5e604b0921732bfa44efc3d2fe20eab SHA-1: 6ff383a4a86d0d49b3490313e466ac61c8d03b0f SHA-256: 16bd2e164bb734899f9e45d2ee92c74e7ac5a38ff6e8628dc21ebdea0d11180b
182 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF repositories. The presence of a fake CAPTCHA and a password-protected archive lure suggests an attempt to trick the user into downloading or interacting with malicious content. The primary URL points to a 'Roblox Password Hack' page, indicating a social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-password-hack-website-game-hack
    • http://library.atim.ac.id/repository/games-like-roblox-free-no-download_GM431946152.pdf
    • http://library.atim.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-free-spins-fb_GM406889139.pdf
    • http://library.atim.ac.id/repository/minecraft-fly-hack_GM479516143.pdf
    • http://library.atim.ac.id/repository/free-coin-master-credit_GM406889139.pdf
    • http://library.atim.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-hackers-list_GM431946152.pdf
    • http://library.atim.ac.id/repository/my-minecraft-account-was-hacked_GM479516143.pdf
    • http://library.atim.ac.id/repository/free-tiktok-like_GM835599320.pdf
    • http://library.atim.ac.id/repository/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://library.atim.ac.id/repository/roblox-how-to-get-free-gears_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-free-spin-bonus_GM406889139.pdf
    • http://library.atim.ac.id/repository/how-to-hack-someone-on-roblox-without-password_GM431946152.pdf
    • http://library.atim.ac.id/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdf
    • http://library.atim.ac.id/repository/i-want-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/apps-to-get-free-robux_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-robux-codes_GM431946152.pdf
    • http://library.atim.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdf
    • http://library.atim.ac.id/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdf
    • http://library.atim.ac.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004ff1.bin
6b7d746f87c94d8bf9e0963158334302a7a7391337f2ecac4c4b1b001cbfa198		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FF1 24856 bytes
font_01_sfnt_off00008859.bin
06c536af866e21d922aef9c033df3f79e3b9202fa6d6397554b0ce1c28103b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8859 19096 bytes

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