Malicious PDF — malware analysis report

Static analysis result for SHA-256 745b9d81d5b52e43…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 08:38:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: d13f8c2eade125f1d179bcfa4187ed0e SHA-1: 3a0b267a1ddbb8712774f556efb0b07809c36a83 SHA-256: 745b9d81d5b52e430afed73cf5329ed5c03c9a0a64eee047c8a70e230c42c477
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/431946152/free-robux-groups-2021-game-hack PDF link annotation
    • https://domoticaaplicada.com/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://domoticaaplicada.com/images/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • https://domoticaaplicada.com/images/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • https://domoticaaplicada.com/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • https://domoticaaplicada.com/images/how-do-you-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • https://domoticaaplicada.com/images/roblox-robux_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://domoticaaplicada.com/images/win-free-robux_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/free-robux-no-downloading-apps_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • https://domoticaaplicada.com/images/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://domoticaaplicada.com/images/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • https://domoticaaplicada.com/images/google-how-do-you-get-robux_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
stream_003_off00004980.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4980 24060 bytes
SHA-256: 66644953768faa5cee20f4effa400bc8c97ecc3f0ae25f0eaa5bc2eaf4aeabe4
font_01_sfnt_off00008094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8094 18592 bytes
SHA-256: 40c688a228a34b1cb0523430700763228a7eb04120cc8b5f4f4e5fd2bdb4007a

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