Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f4e7af8c7f60e2…

MALICIOUS

PDF

45.3 KB Created: 2021-06-10 16:50:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 836ec47cdf37dbd7753d715fd9e8f226 SHA-1: 3e6f9b1f0757bb29f6e4f84bbe27be078125d976 SHA-256: a2f4e7af8c7f60e27d71020e7d9d05ba0f47aed72bf629aa48256579fa3bb55d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are structured as a link farm for SEO purposes, all related to game cheats and hacks. The primary URL, https://netcdn.tw/app/431946152/stella-download-roblox-hack-game-hack, is presented as a direct download for a Roblox hack. The ML classifier strongly indicates maliciousness, and the presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/stella-download-roblox-hack-game-hack
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-robux-hacks-no-verification_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/hack-roblox-fr-jailbreak-fr_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-get-robux-without-paying_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-get-free-robux-codes_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/best-site-for-free-coin-master-free-spin-link_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-robux-codes-generator-no-verification_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/minecraft-aimbot_GM479516143.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/roblox-free-t-shirt-nike_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/rbx-free-robux_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-hacked-apk-download-for-android_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-hack-roblox-accounts-2021-with-wire-shark_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/get-free-robux-without-doing-anything_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-robux-codes-no-verification-2021_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-free-spins-app_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-outfits-roblox_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/roblox-exploit-free-executor-2021-september_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/free-attacks-on-coin-master_GM406889139.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/how-to-get-free-robux-website_GM431946152.pdf
    • http://stmb-multismart.ac.id/perpustakaan/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005350.bin
d5d131b2ad9722585f8af1021dd0a9e20c38eaee0c885ffcb14bb1fc514a4941		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5350 24976 bytes
font_01_sfnt_off00008c79.bin
c9939707e6189198677ae245299efc7cbd7e83362cd6ba4f51009b9a24bdaa54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C79 18792 bytes

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