Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a23011002cb83b…

MALICIOUS

PDF

44.1 KB Created: 2021-05-11 18:46:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 43ee298e28427705d0650c93b0371ab5 SHA-1: 064a83eb5d367d0136326c53b13ad25a3d11d4f5 SHA-256: 51a23011002cb83b82b9987564fcaafe12c60c959c00bedd900dd7d0474c778b
142 Risk Score

Malware Insights

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

The PDF contains a fake CAPTCHA lure to trick users into clicking malicious links. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to potentially malicious or scam-related content. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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/406889139/coin-master-for-pc-free-download-game-hack PDF link annotation
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.businessloanspecialist.com/uploaded_files/userfiles/files/easy-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_003_off00004f82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F82 25300 bytes
SHA-256: ad8f5d0809334aedb4b6fbba9c6a33747d796436ebe700293b76a8a82ba71ae7
font_01_sfnt_off000089ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89AC 18444 bytes
SHA-256: 18ae433c1d0f5bc2fe10e6dfbf0aca6b22c4c0235d4a9956da93b42289fa32de

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