Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b23bd4e91c54207…

MALICIOUS

PDF

44.0 KB Created: 2021-05-15 15:32:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4b1e4135db89786834e5af35a50668db SHA-1: 6ebefb3c63142d9e336afdb91870f295b2c45482 SHA-256: 4b23bd4e91c54207aa5a741f4e710c2698b98f0c16ee402ddb0f1580230117e5
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 0.9969

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-generator-no-human-verification-or-survey-2021-game-hack PDF link annotation
    • https://financia-business-school.com/static/upload/files/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/www-robux-us_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/unlimited-robux_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/daily-spin_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/roblox-lovenet_GM431946152.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://financia-business-school.com/static/upload/files/how-to-win-attack-madness-in-coin-master-hack_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_off00004cd0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CD0 25284 bytes
SHA-256: 11c438dee22629a1f4f1fa1250dceec1e1ad8ae2b7f25d5a7f6363396184d134
font_01_sfnt_off000085ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85AD 19556 bytes
SHA-256: 3a60cdb248c638d1e974f8488a9d0c49865e0dbecbd8cc682acbe36144e2e86e

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