Malicious PDF — malware analysis report

Static analysis result for SHA-256 94d323957d83267a…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 22:51:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2d0ff1ee120dcd353de882680ef036ed SHA-1: 483ca881eda980c0720afb06eff71a637b7eab44 SHA-256: 94d323957d83267a16ec258fe51f69b8121ecf2dce9caac6fd30a97cc17e9464
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 0.9832

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/free-stuff-roblox-catalog-2021-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/spin-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-link-2021-march_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-game-download_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_off000053b0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B0 26340 bytes
SHA-256: 8f20e7d63a5cd52db7fd69ba920f3b4e552c1ef17e1a94da5ac1a9e1d36850e5
font_01_sfnt_off000091af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91AF 19112 bytes
SHA-256: 698dd3f434b362ae2f82dceece5a04064e34e0bdbaff58139516c07fdb3cf389

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