Malicious PDF — malware analysis report

Static analysis result for SHA-256 600d41ad7b8a4cef…

MALICIOUS

PDF

47.2 KB Created: 2021-05-16 04:04:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9430e305a7db4e1c1638f0bf02fc6269 SHA-1: d74a79525066904c5c7ac7f7dcc684b2fc5919ae SHA-256: 600d41ad7b8a4cef5dbb2d1745074c86d3ad57aa319891ccd7d5e5b20d03f34d
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/431946152/free-roblox-com-game-hack PDF link annotation
    • http://hardbit.cn/images/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-stream_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-codes-generator_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://hardbit.cn/images/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-arsenal-hacks_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-free-spins-hack-download_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/coin-master-hackcom-xyz_GM406889139.pdfIn PDF document text
    • http://hardbit.cn/images/www-bandicam-com-free-robux_GM431946152.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_off000049c1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49C1 25736 bytes
SHA-256: 38c5203eea98fd7ceed7dfc8b38614e9ce707ffdb6217e669f6bdb0536bba26b
font_01_sfnt_off00008485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8485 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off00009668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9668 18208 bytes
SHA-256: a8b78c346849e492d79c6e108c6b39d90d98748c1a8fa70f2ffbc01f5a97eafd

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