Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65c0c4c7e092b5b…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 21:10:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 03ed5dfafe015f68dae1644cdac0a008 SHA-1: 6d387c00762746989a796e9da5727dc12c11ecac SHA-256: b65c0c4c7e092b5b39b7f550f60c567ce3e652ad74212468704dd4823ae8a3be
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA to trick the user into interacting with a malicious link, likely to download a second-stage payload. The embedded URL points to a resource that appears to be related to game hacks or cheats, further supporting a malicious intent. No scripts were extracted from this sample.

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/monttechscom-coin-master-free-spins-game-hack PDF link annotation
    • https://kojak-group.com/userfiles/files/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-mod-version-free-download-v344_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/androeed-ru-minecraft_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-get-a-cape-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-robux-instantly_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/free-minecraft-account-and-password-generator_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-mod-version-free-download-34-4_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/scaffold-minecraft-hack_GM479516143.pdfIn PDF document text
    • https://kojak-group.com/userfiles/files/coin-master-free-spins-bit-ly_GM406889139.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_off00005290.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5290 24268 bytes
SHA-256: 07ea17a73f994fea4905f8bf9383e040f3cca07e30f72d228ed6b71f33ab16d0
font_01_sfnt_off00008a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A10 18312 bytes
SHA-256: 92011c413d28d9105f5555a2bfd896bdfa222da96c5b2a9fa19801a7c329aebe

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