Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfffff9e6405d4e…

MALICIOUS

PDF

43.9 KB Created: 2021-06-09 04:26:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 061bcf69f135f2e90b5ab2a239e21f77 SHA-1: aeb80004c3bd3c908a8a2adcf1bfaf6384e7425c SHA-256: 7bfffff9e6405d4ee3ec00b642a4cac02ac9eae34d0dd2ee03ec1c097fdca27b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure and a large number of external links, many of which point to PDF files with game-related keywords. The ML classifier strongly flagged this PDF as malicious. The presence of external URIs and the link farm suggest the document is designed to redirect users to potentially malicious sites or download further payloads, likely exploiting a client execution vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/best-roblox-hacks-2021-game-hack PDF link annotation
    • http://prazdnik-kzn.ru/images/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/pepsi-hacks-roblox-script-cbro_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/without-human-verification-pubg-uc-hack_GM1330123889.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/play-games-for-robux_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/pubg-uc-buy_GM1330123889.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/pubg-uc-zip_GM1330123889.pdfIn PDF document text
    • http://prazdnik-kzn.ru/images/coin-master-free-coins-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
stream_004_off00004f2d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F2D 24768 bytes
SHA-256: 3ee7841621ef022608e61d94f62efc7e22d1e003936071558a50b5154d8fe92a
font_01_sfnt_off00008791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8791 18688 bytes
SHA-256: 957530f40e0ca822ad4aea8847e0bd41f11d9cd6a12b974852dff2bf1efb564a

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