Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1be2bf36d6a1862…

MALICIOUS

PDF

45.5 KB Created: 2021-06-10 22:00:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 305d25cba75d972b90f4bd7b2708df73 SHA-1: efe548e54056461a0c50a849abf726db40cf3c52 SHA-256: d1be2bf36d6a1862f8f5e6c6f274efff9a06c24c99e4c159c212e5422d85a845
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a 'download' lure to trick users into clicking a link, which is a common tactic for phishing or malware distribution. The embedded URL points to a site offering 'free Robux', a typical lure for scams. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it may contain embedded JavaScript or exploit code to facilitate the download or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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-get-free-robux-2021-no-scam-game-hack PDF link annotation
    • http://lib.untad.ac.id/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/make-your-own-minecraft-server-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/rbx-land-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-good-hacker-names_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/robux-gainer_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/rbx-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • https://rblx.landIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005036.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5036 26364 bytes
SHA-256: e973ebf55268987bbb1da3bb60c708f3d8d2ad5abe812cc2b1ed3eec0e98082d
font_01_sfnt_off00008ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CA4 19172 bytes
SHA-256: 94ef534ce6e1e0a6a408dfc8d27e95ed45898e02c51192648277fd4d346a0ef6

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