Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8f0cf76a716891…

MALICIOUS

PDF

36.1 KB Created: 2021-06-19 15:01:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3c832c932dd62c9857c04cc8d0a3495e SHA-1: 0df1c9ed9f0173d755f815d2f1b1bbb9e047f36d SHA-256: 1b8f0cf76a716891cd464bbe1d1f1107976d481c1fe136ce75c51e5e42872583
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, identified as a 'PDF_SEO_LINK_FARM', suggesting a tactic to distribute malicious content or phish users. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' lure further supports a malicious intent. The primary IOC is the initial external URI, which likely leads to a malicious payload or phishing page.

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/black-adidas-t-shirt-roblox-free-game-hack
    • http://perpus.masda.ac.id//repository/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/free-exploit-injector-roblox_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/coin-master-hack-apk-2021-ios_GM406889139.pdf
    • http://perpus.masda.ac.id//repository/what-do-points-do-in-roblox_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/free-2021-robux_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-link-quora_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/roblox-theme-park-tycoon-2-cheat-codes_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/get-free-spins-on-coin-master-2021_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdf
    • http://perpus.masda.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdf
    • http://perpus.masda.ac.id/repository/robux-free-2021_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/www-coin-master_GM406889139.pdf
    • http://perpus.masda.ac.id//repository/if-you-delete-minecraft-can-you-redownload-it-for-free_GM479516143.pdf
    • http://perpus.masda.ac.id/repository/free-robux-apk-mod_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/roblox-murder-mystery-2-cheat-codes_GM431946152.pdf
    • http://perpus.masda.ac.id/repository/free-robux-rbxtools_GM431946152.pdf
    • http://perpus.masda.ac.id//repository/minecraft-free-download-mac-full-version_GM479516143.pdf
    • http://perpus.masda.ac.id//repository/free-minecraft-com_GM479516143.pdf
    • http://perpus.masda.ac.id/repository/how-many-levels-are-in-coin-master_GM406889139.pdf
    • http://perpus.masda.ac.id//repository/how-to-download-tiktok-free_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000326c.bin
3cf616032f00cfb314de1723b93ace02665434df66b86b6fc6162a70e98ce0f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x326C 23496 bytes
font_01_sfnt_off0000678a.bin
62b8d5f3a92719257a03f7054fd6be75fea73776331d0e3a07041ca6ddb9d97e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x678A 19384 bytes

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