Malicious PDF — malware analysis report

Static analysis result for SHA-256 9962c0e839a62cf0…

MALICIOUS

PDF

44.5 KB Created: 2021-06-04 02:12:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 39aedc0f2a04c2d85a2cdde164308145 SHA-1: dfbe79b5e5a4fe69bf1da7aa65f2ffecf691ebc9 SHA-256: 9962c0e839a62cf0c7da7f169dd86156c0393a35e27b30f126d58a5b8906affc
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with it, which is a common social engineering tactic. It contains an external URI pointing to a suspicious URL, likely intended to deliver a secondary payload. The ML classifier also flagged this PDF as malicious with high confidence.

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.online/app/406889139/25-free-spins-coin-master-game-hack PDF link annotation
    • https://library.um-sorong.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/rbx-sites_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-master_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • https://library.um-sorong.ac.id/repository/roblox-freebies-free-robux_GM431946152.pdfIn 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_off0000524b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x524B 24884 bytes
SHA-256: 68cb7756611a8b8faf6775370891ce5a677577dd92d52b477da274b88fe147c9
font_01_sfnt_off00008baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAF 18144 bytes
SHA-256: e61324631e03e98c071e12442239b73d0a12fcb8243797d210d051c8d69b565d

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