Malicious PDF — malware analysis report

Static analysis result for SHA-256 39da51761a7b6fd3…

MALICIOUS

PDF

52.2 KB Created: 2021-06-03 21:49:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 562c425e76d4c52028429c0a73900b48 SHA-1: a9b22b610facb07fb82022fb8cb8ea0ec40c5987 SHA-256: 39da51761a7b6fd3cc74bc9cb9a662f09e534920bccac62b9b4a4ffe57180592
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 0.9464

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.online/app/406889139/hack-coin-master-online-without-human-verification-game-hack PDF link annotation
    • http://librarysenior.com/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-hack-apk-facebook-login_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-logo-maker-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/krnl-roblox_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://librarysenior.com//repository/roblox-c9m_GM431946152.pdfIn PDF document text
    • http://librarysenior.com//repository/coin-master-free-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://librarysenior.com/repository/coin-master-hack-cheat-engine_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000559d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x559D 27052 bytes
SHA-256: 3bd04b62480882c1c3eff25c51623e2f1e9b2161d398cd28e427bac01b264de0
font_01_sfnt_off0000941a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x941A 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_02_sfnt_off0000a8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8A5 18688 bytes
SHA-256: aff6012002d7c8d1238c8ca496166b12a8d25d6fb5282892c0f4493fdd227159

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