Malicious PDF — malware analysis report

Static analysis result for SHA-256 934f8ce363e98add…

MALICIOUS

PDF

43.2 KB Created: 2021-05-12 17:00:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: e898ecbd877e170f8c71888b6333abcb SHA-1: a49fa35c72e7df60caa9e215e750704700c54ee4 SHA-256: 934f8ce363e98add739b3691fa306bc617b953d3277fdb66fa0f87b22a4ab8b5
182 Risk Score

Malware Insights

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

This PDF document is designed to trick users into clicking malicious links by impersonating brands and presenting a fake CAPTCHA. The document contains numerous links to external websites, many of which are hosted on `netcdn.xyz` and `yatatravel.com`, and appear to be related to game hacks and free in-game currency. The presence of a fake CAPTCHA heuristic indicates an attempt to bypass user caution. No scripts were extracted, but the document's structure and embedded links strongly suggest a credential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/huskybucks.com-free-robux-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.xyz/app/431946152/huskybucks.com-free-robux-game-hack PDF link annotation
    • https://www.yatatravel.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/real-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/archery-master-3d-apk-and-mod-free-download-unlimited-coins_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/pig-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/ww-roblox-come_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/free-spin-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/how-to-get-free-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.yatatravel.com/uploaded_files/userfiles/files/roblox-free-play-no-download_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_off00004ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AD1 26028 bytes
SHA-256: 116f821aae7f37fccda29142045362d28ee51bfb534d1a1bb435af4a4c3699f9
font_01_sfnt_off00008544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8544 18688 bytes
SHA-256: 6988f73f4b0746331af176c61d8a6d12afd54d9d4021c1ba8a7576897a1c52a2

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