Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dcaa5cb4f67075…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 09:13:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: eb44c9f10a87391932dddd838796ecdb SHA-1: ef4aca42f859289fb2d670d2dd9c7858cad8577a SHA-256: 21dcaa5cb4f670755dd9f417703e2c65d41905b2eed1a9c4c57a99c547f2ec1b
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://netcdn.tw/app/406889139/coin-master-hoe-to-get-extra-free-spins-game-hack PDF link annotation
    • https://cheryco.ir/assets/public/js/uploading/files/free-account-roblox-2021_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-easy-and-fast-on-phone_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-free-pants_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/give-free-robux_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/wie-kann-man-in-roblox-hacken_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-unlimited-spin-hack_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/how-to-go-300-free-diamonds-on-roblox-royale-high_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/hack-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/coin-master-hack-ios-without-verification_GM406889139.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/roblox-hack-tower-battles_GM431946152.pdfIn PDF document text
    • https://cheryco.ir/assets/public/js/uploading/files/what-is-exploiting-in-roblox_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
font_00_sfnt_off0000336d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x336D 22512 bytes
SHA-256: 4782c953ee865e7b1f0cbfd747055fe09ba3ceb37869c38dc5c7a40fddc0197c
font_01_sfnt_off00006584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6584 18384 bytes
SHA-256: 6172b2728ec80ea06aed9adde43ce4503c90957b8bc0762058e1569cf76c303d