Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d0ed839adf251f…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 02:46:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 84d8206337f31e368e077f467f1d7e9c SHA-1: 2ea0727a5f56ae6a88ade67de87b01467f5b3b4f SHA-256: b6d0ed839adf251f079e8e2733b812e9e3db1780113b377c5961470d9a3293cf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that link to external sites, many of which are SEO-optimized PDF files related to game hacks and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these external links, suggesting a tactic to drive traffic to potentially malicious or ad-filled pages. The presence of a download button lure further supports the malicious intent of directing users to external content.

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.tw/app/431946152/www-free-robux-game-hack
    • http://elib.upiyptk.ac.id/opac//repository/free-robux-without-verification_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/2021-roblox_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac//repository/coin-master-hack-2021-ios-download_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/apps-that-give-you-free-robux_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/cheats-roblox-get-free-robux_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/get-robux-now-for-free_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/hacker-minecraft-song_GM479516143.pdf
    • http://elib.upiyptk.ac.id/opac//repository/free-spins-coin-master-app-ios_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-to-hack-any-roblox-account_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/free-hair-roblox_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/tiktok-free-qr-code_GM835599320.pdf
    • http://elib.upiyptk.ac.id/opac/repository/is-kinetic-code-going-to-be-free-roblox_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac//repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/free-robux-club-for-free_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/coin-master-hacks-free-spins_GM406889139.pdf
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-robux-without-human-verification-on-ipad_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/como-hackear-roblox-robu-gratis_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/free-roblox-gift-card-codes-2021-unused_GM431946152.pdf
    • http://elib.upiyptk.ac.id/opac/repository/how-to-get-free-roblox-cards-no-surveys_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fd1.bin
8430c2e7263bd3ff5148d411f1f0c006e982cc82ed551d180fbdd79a993b6cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD1 22624 bytes
font_01_sfnt_off0000629d.bin
acf5ca21e1b57f7804790e88d3c8e797014eccbd964a564fa6b8ab1e1ef3ee82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629D 19080 bytes

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