Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6224dc59cc3f23d…

MALICIOUS

PDF

44.9 KB Created: 2021-06-14 01:44:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7ebae25c18a44eb42e04c9df439ba464 SHA-1: 59043c2fa9d167e13238a54e48c3d6a1a78c3336 SHA-256: b6224dc59cc3f23d86cb711da545361fe1f5c093165369da4cb1e2afe2026d55
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/five-nights-at-freddy PDF link annotation
    • https://zarco.co.in/uploaded_files/userfiles/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-free-roebucks-in-roblox_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-roblox-pin-codes_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/buy-robux-free_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/how-to-get-verified-on-tiktok-for-free_GM835599320.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-shirt-roblox_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://zarco.co.in/uploaded_files/userfiles/files/link-for-free-spins-on-coin-master_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_003_off00004c88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C88 26868 bytes
SHA-256: 16f9f5afb3e960c538c3c32690217f59d201bcb820af50198ed9975f821b9720
font_01_sfnt_off00008a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6D 19156 bytes
SHA-256: 018b108db3d23eb0cd74cc0d138333fe95920bca5cd08558bbb319f94ce2f983

Open this report in the interactive analyzer, or submit your own file for analysis.