Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc3bb9868a3607a…

MALICIOUS

PDF

45.2 KB Created: 2021-06-09 11:33:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ede42501fe424f6b9bf63912e3d80368 SHA-1: bb59e99ee1d90b0727eb9c716a2d7cc633a2739b SHA-256: 9dc3bb9868a3607ae34c5337c2cf44fc83bdbf3c8028968c2ade80e126d6b013
142 Risk Score

Malware Insights

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

This PDF document employs a social engineering lure, specifically a browser extension or update installation pretext, to trick users into clicking malicious links. The document body and extracted URLs suggest a theme of 'hacks' and 'free coins' for games, aiming to exploit user interest. The presence of numerous external links, many pointing to PDF files with game-related slugs, indicates a link farm designed to drive traffic to potentially malicious sites or host further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.tw/app/431946152/hacks-for-pet-ranch-roblox-for-free-coins-game-hack
    • https://library.sman1berau.sch.id/repository/coin-master-fan-page-facebook_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/can-i-get-robux-for-free_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/how-to-get-followers-on-tiktok-for-free_GM835599320.pdf
    • https://library.sman1berau.sch.id/repository/free-pet-food-for-coin-master_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/roblox-walk-through-walls-hack-cc_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/coin-mster-free_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/free-robux-2021-no-verification_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/minecraft-online-free-no-download_GM479516143.pdf
    • https://library.sman1berau.sch.id/repository/hack-para-anime-cross-roblox_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/bloxburg-roblox-hacks_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/pubg-5-uc-buy_GM1330123889.pdf
    • https://library.sman1berau.sch.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/roblox-hack_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/roblox-jailbreak-hack-download_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/free-spin-coin-master-iphone_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/descargar-hack-coin-master_GM406889139.pdf
    • https://library.sman1berau.sch.id/repository/minecraft-pe-free-download-ios_GM479516143.pdf
    • https://library.sman1berau.sch.id/repository/roblox-clean-hacks-xyz_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • https://library.sman1berau.sch.id/repository/earn-free-robux-on-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000517c.bin
3fac6bbacb00ef804f75b30dc56b3bc665aa323698b549ffe1cd0aac5491d1a0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517C 25676 bytes
font_01_sfnt_off00008c5f.bin
24ce82ce75201e146c446878bf0b8fa8d1849e295f9ef759ff991cf532eb3a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C5F 18888 bytes

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