Malicious PDF — malware analysis report

Static analysis result for SHA-256 d22a1aadebf00e0f…

MALICIOUS

PDF

47.2 KB Created: 2021-06-13 19:45:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ce35863290c74203bf970b3ac6b5ec1b SHA-1: 6a74bdd20b24b55fbe9e7403da2854608f685eb6 SHA-256: d22a1aadebf00e0f25b609acb13613a5bdc9fba97f308be09e1b5378e2c93768
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA or human verification prompt to trick the user into downloading a payload, likely a malicious executable, from the embedded URL. The content, referencing free Robux and game hacks, is a common lure for such attacks. While no scripts were directly extracted, the PDF structure and heuristics indicate it's designed to lead the user to a malicious download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://netcdn.co/app/431946152/youtube-free-robux-2021-bluebig-game-hack
    • http://library.ulb.ac.id//repository/open-coin-master_GM406889139.pdf
    • http://library.ulb.ac.id/repository/coin-master-fb-free-spins-link_GM406889139.pdf
    • http://library.ulb.ac.id//repository/coin-master-village-4_GM406889139.pdf
    • http://library.ulb.ac.id//repository/mobihack-roblox-hack_GM431946152.pdf
    • http://library.ulb.ac.id/repository/oprewards-robux_GM431946152.pdf
    • http://library.ulb.ac.id/repository/how-to-get-minecraft-for-free-on-phone_GM479516143.pdf
    • http://library.ulb.ac.id/repository/robux-gratis_GM431946152.pdf
    • http://library.ulb.ac.id/repository/how-do-you-get-free-robux-without-buying-apps_GM431946152.pdf
    • http://library.ulb.ac.id/repository/appsmob-coin-master-hack_GM406889139.pdf
    • http://library.ulb.ac.id/repository/free-minecraft-severs_GM479516143.pdf
    • http://library.ulb.ac.id/repository/coin-master-daily-free-spins-2021_GM406889139.pdf
    • http://library.ulb.ac.id/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdf
    • http://library.ulb.ac.id/repository/minecraft-bedrock-for-free_GM479516143.pdf
    • http://library.ulb.ac.id//repository/free-robux-generator-2021_GM431946152.pdf
    • http://library.ulb.ac.id//repository/coin-master-hack-ios-no-verification_GM406889139.pdf
    • http://library.ulb.ac.id//repository/free-game-packs-for-coin-master_GM406889139.pdf
    • http://library.ulb.ac.id/repository/free-spin-appscoin-master_GM406889139.pdf
    • http://library.ulb.ac.id/repository/roblox-robux_GM431946152.pdf
    • http://library.ulb.ac.id/repository/coin-master-link-for-spins_GM406889139.pdf
    • http://library.ulb.ac.id/repository/www-roblox-hack-me_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b54.bin
694c4ff7592f41b47ef43b0c15ee1e4e408cabb8f8e58b724f90f1ef5e4e2f07		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B54 32688 bytes
font_01_sfnt_off000093fb.bin
7109149306afd24b194dc6c148bacc7c0b7e56358b524b6140bf23e713b69635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93FB 19164 bytes

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