Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dfd6ebd586d62c…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 22:32:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d7c250976bafbf53fa03e1f60d6a0114 SHA-1: ee92c39571b97a2a85fb3cc74423ed3e865c0211 SHA-256: 83dfd6ebd586d62cc7587b158be522fcad8a837ba35fa4a7e66fac47d8db80e6
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a lure related to 'free spins' and 'game hacks', directing users to a suspicious URL. The presence of a fake CAPTCHA heuristic further suggests an attempt to trick users into interacting with malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate a malicious intent to redirect users to potentially harmful websites.

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/406889139/claim-free-spins-coin-master-game-hack PDF link annotation
    • http://perpustakaan.dutadharma.ac.id/repository/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-free-spins-2021-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/tampermonkey-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-firebird-card-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.dutadharma.ac.id/repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn 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_off00005078.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5078 24484 bytes
SHA-256: 86693df5ec18ee7b5b2c6fcf5294e377893effc190ca29aaf2c66c963d64689c
font_01_sfnt_off00008850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8850 18220 bytes
SHA-256: a27868aca9095d1db43e3a34661a683bdd93dcaecb4c52cce590f5e85fca806a

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