Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb90668d4cd6581…

MALICIOUS

PDF

34.6 KB Created: 2021-07-05 17:40:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9fa97f418caa87e50b83ec437c871d63 SHA-1: 0e2a0c9f64b890fa8dc6c2c3ade785188425747a SHA-256: dcb90668d4cd65812150ccd66430802b5c8f72c6dd935a50293bf879c02785ba
82 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 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 0.9980

Heuristics 4

  • 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.
  • 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-fan-page-free-spins-game-hack PDF link annotation
    • https://htdvn.com/public/upload/files/roblox-hack-ga_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-no-hack-or-cheat_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/dominus-rex-for-free-roblox-extreme-hacks_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/robux-download_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-faces-on-roblox-no-download_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hack-de-roblox-de-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/minecraft-tiktok-hacks_GM479516143.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-script-executor-for-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/paginas-web-para-conseguir-robux-gratis-sin-hacks-2021_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/hacked-skybox-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-hack-2021-acc-roblox_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://htdvn.com/public/upload/files/how-can-i-get-free-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
font_00_sfnt_off000031ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AD 22808 bytes
SHA-256: 1558d8f81d08d3572f2e74722d58fa8f121e7ff4d16930622a4eace9c5c7207f
font_01_sfnt_off000064b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B4 18328 bytes
SHA-256: fc07e399d569c9cb0326c2788f4b655073573cb4c501715abae06525b94755db

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