Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99e448a80cf6551…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 11:52:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4a3405a6a983bbb3a2a10402c216750c SHA-1: b50687167f088e38891c7358753f5d9e6f4166ba SHA-256: b99e448a80cf65515c783b6b975028e12df0e5d78f6a3ec142f818952c3b60f6
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 0.9971

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 https://netcdn.xyz/app/431946152/cpbild.co-robux-game-hack PDF link annotation
    • http://rgadventure.com/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/are-there-any-coin-master-hacks-that-actually-work_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/app-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/hack-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-cards-and-spin-link_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/win-free-robux_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://rgadventure.com/userfiles/files/free-roblox-printables_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
font_00_sfnt_off0000485a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x485A 24812 bytes
SHA-256: 2ecef51fa1ac2604ba072df054948ad5951c79d329ff90111f10acae2ca5fe47
font_01_sfnt_off00008112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8112 18460 bytes
SHA-256: 99048da186b71c9dfc5fc272bc085340ca0662c1721045875ee4c725f3f8eda0

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