Malicious PDF — malware analysis report

Static analysis result for SHA-256 e241511cb8375b3f…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 08:58:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 96dd63a987547a8c314e628217f6375e SHA-1: 262709e7d392d0cf5c22650d8a4e65637ab1f043 SHA-256: e241511cb8375b3f7377ac47d040408fffa32a89728e77c89237547e298a2ac8
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/479516143/free-minecraft-server-maker-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/hack-coin-master-nyc_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-app-real_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-freebies_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-spin_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-pins_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/is-windows-10-minecraft-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-make-a-minecraft-java-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-mod-apk-2021_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_off000051e2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E2 25184 bytes
SHA-256: ab91bfc4d755233baea10030b2a9d38b889f888bc0fec59d95ed68967e815a11
font_01_sfnt_off00008b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B03 17852 bytes
SHA-256: a2113846211f941d41962086a33418b46c13efddcea93467eebdb757cad7d920

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