Malicious PDF — malware analysis report

Static analysis result for SHA-256 738b2b223d6daba4…

MALICIOUS

PDF

43.0 KB Created: 2021-05-13 02:49:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3825a5e546fef8f61b8a88f1503a0284 SHA-1: 9358a0533b6dd0a5cff5f49d1a7f89ca0bb5224d SHA-256: 738b2b223d6daba44898157632313b2eee1bd96e348802aca2acaf6f04d73cd9
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 0.9971

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/free-spins-in-coin-master-without-human-verification-game-hack PDF link annotation
    • http://julo-it.net/images/coin-master-70-spin-link-2021_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-daily-free-link_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-spins-deutsch-download-ios-link_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://julo-it.net/images/free-headless-head-roblox_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/hack-my-game-xyz-coin-master_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://julo-it.net/images/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-chip_GM406889139.pdfIn PDF document text
    • http://julo-it.net/images/coin-master-free-spins-moonactive_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_003_off00004ade.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ADE 25264 bytes
SHA-256: d6bc9620ee85dd01dc94f5981b91b07e54b034568c5fca06cc668cec6ac4ea46
font_01_sfnt_off0000848a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x848A 18784 bytes
SHA-256: 2f08f52b73595fa95dbe25467555bd1443f7cdd3e7404a9db3231e6e64119a30

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