Malicious PDF — malware analysis report

Static analysis result for SHA-256 571db64ce7dcd793…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 23:31:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e16788acf6b0da66ba00ec16e10afcdb SHA-1: f6685121f4487cd3f2161b53e181de8c548d685d SHA-256: 571db64ce7dcd793353093c9c582d5277af7b456dd5f1e24d1c752a3df00f7f9
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 0.9865

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.online/app/431946152/www-free-robux-com-game-hack PDF link annotation
    • http://opac.stiesa.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/hack-game-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-games-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/free-roblox_GM431946152.pdfIn PDF document text
    • http://opac.stiesa.ac.id/repository/2021-free-spins-coin-master_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_004_off00005091.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5091 26504 bytes
SHA-256: 1cc25f0d94c335227c9f7f67d27ebe48a6ec86739094aae6e212cd07f8506e55
font_01_sfnt_off00008c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C19 18636 bytes
SHA-256: 9f7262e815bd0044d2d3715e2ef4b4760a787eb7fc9de28673ce11fb32ae2f7d

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