Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4313846e5151fd…

MALICIOUS

PDF

45.7 KB Created: 2021-05-12 11:34:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3c819bfb007bf255afb4df403d86cbe3 SHA-1: 842d7bcbb529fa3f9041474f72a78cd14f7d2a80 SHA-256: 1b4313846e5151fd3e4252b62b7db847bb9371761ea4bdef7eec6aa7605bac3c
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The document displays a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URI points to a URL associated with free Robux, a typical theme for phishing or scam attempts. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.xyz/app/431946152/free-robux-co-game-hack PDF link annotation
    • http://www.elibrary.fl.unud.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/latest-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/roblox-source_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/mcpe-master-coins-hack-download_GM406889139.pdfIn PDF document text
    • http://www.elibrary.fl.unud.ac.id/repository/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://elibrary.fl.unud.ac.id/repository/hack-para-coin-master-singapore_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a73.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A73 26060 bytes
SHA-256: 6b7ef3566ab16e974c236b1e6303f2bc467603cd08ba9966eaa6d96f568d1225
font_01_sfnt_off00008741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8741 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off000090f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90F2 18012 bytes
SHA-256: 3ef9e48aa3d97d4217e004f7625a8cbae9320a74231b80a01553f6433e422360

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