Malicious PDF — malware analysis report

Static analysis result for SHA-256 08beb8d562870e09…

MALICIOUS

PDF

45.8 KB Created: 2021-06-11 13:20:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b8ac7a4616a87ea5b86cefe6a6326d9e SHA-1: caa137303169f65417147ad79554a3489d57d4ea SHA-256: 08beb8d562870e09ab1e6b8d905dbb7aec371653576dd9584957ebd40e2fb975
182 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing or malware distribution lure. It impersonates the brand 'Amazon' and presents a fake CAPTCHA to trick the user into clicking a link. The document contains a mass of external links, many of which appear to be SEO-optimized PDF links, suggesting a link farm designed to drive traffic or distribute malicious content. The primary malicious URL identified is https://netcdn.tw/app/431946152/how-to-get-free-hair-in-roblox-2021-game-hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/how-to-get-free-hair-in-roblox-2021-game-hack.
  • 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.tw/app/431946152/how-to-get-free-hair-in-roblox-2021-game-hack PDF link annotation
    • http://repository.unla.ac.id/repository/free-cafe-groups-on-roblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-break-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/promo-code-list-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-roblox-adopt-me-accounts_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-free-login_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-pets-in-adopt-me-roblox_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_off00004e76.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E76 28144 bytes
SHA-256: 6fb1fa4c587bb2e404d94e40e5b21f91df36a92b8df69dda176fc2621e923548
font_01_sfnt_off00008e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E39 18968 bytes
SHA-256: 8acd0865a6f1a394e3ba9e90fbf7139c4c1ef75cdacf128dd16823644214e6be

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