Malicious PDF — malware analysis report

Static analysis result for SHA-256 56775304ef82204e…

MALICIOUS

PDF

47.4 KB Created: 2021-06-07 09:25:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 11e7e1705616c420c0d7befd1f7630a9 SHA-1: cd88da87b463bb531e4d2905ea4fa311358f4342 SHA-256: 56775304ef82204e464a0c23b8030e18e2fef37290bf093bb848302258a2c51b
82 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with the document. It also embeds external URIs, such as 'https://netcdn.tw/app/431946152/how-to-hack-roblox-accounts-on-pc-game-hack', which likely lead to malicious content or further downloads. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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-hack-roblox-accounts-on-pc-game-hack
    • http://altc.de/images/hack-spin-coin-master-2021_GM406889139.pdf
    • http://altc.de/images/roblox-hack-tool_GM431946152.pdf
    • http://altc.de/images/twitter-coin-master-free-spins_GM406889139.pdf
    • http://altc.de/images/coin-master-free-spin-app-apk_GM406889139.pdf
    • http://altc.de/images/get-2021-free-spins-on-coin-master_GM406889139.pdf
    • http://altc.de/images/archery-master-3d-coins-hack_GM406889139.pdf
    • http://altc.de/images/coin-master-free-spins-link-iphone_GM406889139.pdf
    • http://altc.de/images/robux-hack-no-human-verification_GM431946152.pdf
    • http://altc.de/images/free-robux-2021-april_GM431946152.pdf
    • http://altc.de/images/free-spins-coin-master-app-ios_GM406889139.pdf
    • http://altc.de/images/free-robux-cards_GM431946152.pdf
    • http://altc.de/images/can-you-play-minecraft-for-free_GM479516143.pdf
    • http://altc.de/images/free-mods-for-coin-master_GM406889139.pdf
    • http://altc.de/images/today-coin-master-free-coins-link_GM406889139.pdf
    • http://altc.de/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://altc.de/images/coin-master-free-cards-link-2021-today_GM406889139.pdf
    • http://altc.de/images/can-you-get-minecraft-for-free-on-pc_GM479516143.pdf
    • http://altc.de/images/free-tiktok-comments_GM835599320.pdf
    • http://altc.de/images/how-to-coin-master-hack_GM406889139.pdf
    • http://altc.de/images/100-hack-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e8e.bin
c2047611054ddeebe397bc0091414279e88b7d5d883e556f5b9b1a42639bd5e4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E8E 30704 bytes
font_01_sfnt_off0000954b.bin
cd3495ad2110a59662c0c638f5cfb89b462a6ea03d07e732361c0ee3e0b033e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x954B 18744 bytes

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