Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b66155ced9c9bc…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 20:48:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f346a9982eed104496091434df0a5f4d SHA-1: 2394339f11f3c7997da8b8fafff98796ab56d7a5 SHA-256: 66b66155ced9c9bc78022f4422186a1c01f6b9f1b228f840163ad3a1a152d490
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 0.9865

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 https://netcdn.tw/app/431946152/hacks-for-roblox-script-reader-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/how-many-levels-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-hack-game-download-mod-apk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hacks-for-assassin-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-any-roblox-game-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-pe_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/pubg-uc-free-2021_GM1330123889.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005120.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5120 25132 bytes
SHA-256: de48d4349360259d9b315a16717220fc9d0389f656c59fed6ec687ce92a4344f
font_01_sfnt_off00008b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B99 18920 bytes
SHA-256: 2dd0c20e6259713b9174f246c395a382ab430fa65ac34a6f7aa82cc9347181cb

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