Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8d9542ab82e778f…

MALICIOUS

PDF

34.2 KB Created: 2021-06-27 21:41:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: eb4e32355e8657bd24abc3ce438239f9 SHA-1: b4cd1ba9de51fd2439d707fa2cfeb2516a65d303 SHA-256: b8d9542ab82e778f85bccaf7375902ee68e3a1d5cca9862ec259ca2e5af72f1e
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites offering cheats and hacks for popular games like Roblox and Minecraft. It impersonates brands such as Microsoft, indicating a credential phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of a mass external link farm further supports a malicious intent, likely to lead users to scam pages or download malicious content.

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.
  • 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: http://netcdn.co/app/431946152/how-to-cheat-robux-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 http://netcdn.co/app/431946152/how-to-cheat-robux-in-roblox-2021-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-clothes-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-hack-roblox-games-no-downloads-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/robux-hack-no-download-no-survey-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/2021-pastebin-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/inspect-element-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-admin-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/easy-way-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-bubble-gum-simulator-cheat-version_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hack-spins-app_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-daily-free-spins-link-2021_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
font_00_sfnt_off00002f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F0E 21804 bytes
SHA-256: 80cb8dd9d15687180a96885a4760635d1e11342e5e2871a1c6051f8007eadf75
font_01_sfnt_off00005f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F29 19464 bytes
SHA-256: 36ac185aa2e6096528cc000a7f5bd1e21ba0b6ba43a0e2c2d463d4e637a73610

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