Malicious PDF — malware analysis report

Static analysis result for SHA-256 6222497cee646c8d…

MALICIOUS

PDF

33.9 KB Created: 2021-06-30 22:42:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 81d54b6eb1557efab01a019c862d2413 SHA-1: 03a7c8770f33f074317723f6a95903d777595c0d SHA-256: 6222497cee646c8d4883b4207cca5588a7279bb7b40bab3906dd3773eada7e85
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains numerous external links, many of which are presented as 'long_title_slug_pdf_links', suggesting a link farm designed to attract users searching for game hacks and cheats. The primary URL, http://netcdn.co/app/431946152/auto-clicker-on-roblox-for-free-game-hack, likely leads to a malicious download or exploit. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.co/app/431946152/auto-clicker-on-roblox-for-free-game-hack PDF link annotation
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/can-i-hack-uc-in-pubg_GM1330123889.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-robux-hack-generator-xbox-one_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/roblox-free-avatar-items-2021_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-robux-com_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-hack-ios-12_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/how-to-get-robux-cheat-way_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/robux-now_GM431946152.pdfIn PDF document text
    • http://joaquimdourado.adv.br/uploads/ckfinder/files/coin-master-daily-free-spins-today_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
font_00_sfnt_off00002c68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C68 22740 bytes
SHA-256: cf327ed9de119b2fdda315eaef566ce166a631530d38d61b878522f07c692066
font_01_sfnt_off00005f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7C 19184 bytes
SHA-256: 1cbef65078bfdb7f1908be576013ad38db7d20704af9a6f66e490d25f5c19436

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