Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7913a5b9bd4d4e8…

MALICIOUS

PDF

44.7 KB Created: 2021-06-08 22:04:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8b54091dbb6ebeee2fbe5bf4d8aa8125 SHA-1: 5762b0b4211a6e921d1776d71f371d979432055a SHA-256: a7913a5b9bd4d4e82071a20967a01d421ab7e9be6467083b61c610dc9a80032b
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 the user into interacting with the document. It also embeds multiple URLs, including one pointing to 'netcdn.tw', which likely serve as landing pages for malicious content or further exploitation. The presence of these elements strongly suggests a phishing or social engineering attack aimed at delivering a payload.

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/are-games-on-roblox-free-game-hack
    • http://umksn.pl/images/today-free-spin-coin-master_GM406889139.pdf
    • http://umksn.pl/images/coins-master-hacks_GM406889139.pdf
    • http://umksn.pl/images/coin-master-hack_GM406889139.pdf
    • http://umksn.pl/images/2021-free-spins-coin-master_GM406889139.pdf
    • http://umksn.pl/images/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://umksn.pl/images/how-to-hack-coin-master-root_GM406889139.pdf
    • http://umksn.pl/images/can-you-get-minecraft-windows-10-for-free_GM479516143.pdf
    • http://umksn.pl/images/get-free-spins-on-coin-master_GM406889139.pdf
    • http://umksn.pl/images/roblox-robux_GM431946152.pdf
    • http://umksn.pl/images/minecraft-windows-10-edition-free-download_GM479516143.pdf
    • http://umksn.pl/images/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • http://umksn.pl/images/best-minecraft-hacked-client_GM479516143.pdf
    • http://umksn.pl/images/hack-roblox-jailbreak-2021-mega_GM431946152.pdf
    • http://umksn.pl/images/how-to-get-roebucks_GM431946152.pdf
    • http://umksn.pl/images/coin-master-cards_GM406889139.pdf
    • http://umksn.pl/images/free-minecraft-alts_GM479516143.pdf
    • http://umksn.pl/images/free-robux-generator-easy-no-human-verification_GM431946152.pdf
    • http://umksn.pl/images/free-robux-generator-no-verification_GM431946152.pdf
    • http://umksn.pl/images/minecraft-free-app_GM479516143.pdf
    • http://umksn.pl/images/minecraft-gun-mod-download-free_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000509f.bin
77d88f80f07ff647e4267bac7170daaf8f79cfa62d275ca17d4febc3569d67b9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x509F 26340 bytes
font_01_sfnt_off00008bcb.bin
8cf3d04a6ad88ec5d7a5be2efd7a02e5853b945897daff266bea1e32b452079f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BCB 18436 bytes

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