Malicious PDF — malware analysis report

Static analysis result for SHA-256 4134dc056362a2e4…

MALICIOUS

PDF

33.6 KB Created: 2021-06-29 08:54:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3665cb06255b7c1298e4da5190e08aa4 SHA-1: 3143446638473ce4f10eba794b84cfeb6b11a164 SHA-256: 4134dc056362a2e40a5ede693a2e9baef4104b4fcb53e2c683e0b0598e03a4b3
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF files related to game cheats and hacks. The primary URL, http://netcdn.co/app/431946152/how-to-have-free-clothes-on-roblox-game-hack, suggests a lure for users seeking in-game advantages. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking malicious links, likely leading to a scam or malware.

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/how-to-have-free-clothes-on-roblox-game-hack PDF link annotation
    • https://smark.com.tw/image/data/files/free-hair-roblox-2021_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/pokemon-go-free-games-online_GM1094591345.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/robux-hack-page_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-dungeon-quest-lvl-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-get-free-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-mad-city-free-vip-script_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-kill-script-hack_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-cc-hacks_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/roblox-generator_GM431946152.pdfIn PDF document text
    • https://smark.com.tw/image/data/files/how-to-change-roblox-username-for-free-2021_GM431946152.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_off00002afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AFD 22816 bytes
SHA-256: aa43f219dc74d0e07a9ebc216c83ca8319b64abdba86cd246213c04e09a35f64
font_01_sfnt_off00005e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E17 19200 bytes
SHA-256: 3c0ccec4c9f8febdd199bb4b8e53a1fcfc66809dd321bee42ec47e07301728f1

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