Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3851af8e245b97f…

MALICIOUS

PDF

35.4 KB Created: 2021-06-29 08:21:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d3df20d1bdda062bc2a1c5b30a704222 SHA-1: f2a7900ca27caa17c8c87c51043a58897e1122b8 SHA-256: d3851af8e245b97f08a5293b97e3888ae0b13177ee7c060798501cb8aaebcaf9
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a call-to-action phrase, suggesting it is designed to trick users into downloading further content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates a potential SEO poisoning or content-luring scheme. The document's content and links relate to popular games, likely to attract a wide audience.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/comment-hacker-roblox-sans-logiciel-youtube-game-hack PDF link annotation
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-generator-club_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-minecraft-gift-codes_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-robux-in-script_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-hack-some-one-with-cookies-roblox_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-net_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/supreme-roblox-t-shirt-free_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/script-hack-roblox-toy-simulator-inf-money_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-tutorial-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/free-robux-limiteds-comlu-com_GM431946152.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • https://www.cow-style.com.tw/upload/files/how-to-get-free-coins-on-tiktok_GM835599320.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
font_00_sfnt_off00003203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3203 22472 bytes
SHA-256: b382dca18987170b9524d2a3f2cd8e92d3b2d222a8c2018808389f94a9864d61
font_01_sfnt_off00006421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 19440 bytes
SHA-256: 3caed4c5caa62aee8b2b932d6592a510c7d519455c4eac339e52e142eee9a4c2

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