Malicious PDF — malware analysis report

Static analysis result for SHA-256 f580f5f3096b23b5…

MALICIOUS

PDF

46.6 KB Created: 2021-05-16 05:55:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4fc9c3d75affb80d63a91dfeb689e8cb SHA-1: a20a102bae3db388d9e1bf70cee1e54d786dbbdf SHA-256: f580f5f3096b23b59f50892de634e99b711f505faf22b6bc7f10d499786ec6ff
122 Risk Score

Malware Insights

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

The PDF document employs a common lure of "game hacks" and "free spins" to trick users into clicking a malicious link. The presence of a fake CAPTCHA heuristic indicates the document is designed to prompt user interaction, likely leading to the download of further malicious content or redirection to a phishing site. The primary IOC is the external URI pointing to a game hack generator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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-free-spin-link-twitter-game-hack PDF link annotation
    • http://sbm-nn.ru/images/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-no-download_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/rbx-earn_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-mod-apk-unlimited-spin-download_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a58.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A58 28556 bytes
SHA-256: b7542ebe8038ebbfb893356646be941b4df0a489aaaf01e99fda23e34fbf6ff3
font_01_sfnt_off000089be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89BE 2912 bytes
SHA-256: 6e07e6753a1b7f3946429eb05e6ec352f38d71971554550c1c0ea562d62df99c
font_02_sfnt_off000093cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93CC 18220 bytes
SHA-256: b594fc670d790d0d446ae286633f4f60e484476280493cebd05396ea33631896

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