Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9508c2c73d923bd…

MALICIOUS

PDF

36.3 KB Created: 2021-07-04 09:17:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b503f2c444e62177104be1fff9499661 SHA-1: 81af0e66b10774f3b9e7f9dc54c11c3237d5412d SHA-256: b9508c2c73d923bd8e5a29e5c473f753b01925d85e11627dc43c3082623c146d
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a "download" call-to-action, suggesting a lure for users to download applications or other content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further indicates malicious intent. The primary goal appears to be directing users to download potentially unwanted or malicious files from external URLs.

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/406889139/archery-master-3d-apk-and-mod-free-download-unlimited-coins-game-hack
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/free-robux-pastebin_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/free-robux-obby-no-password-2021_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/coin-master-fun-free-spins_GM406889139.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/free-robux-and-tix-app_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/how-to-hack-into-any-roblox-account-2021_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/how-to-get-free-robux-in-notepad_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/free-spin-link-coin-master_GM406889139.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/hacker-vs-noob-vs-pro-roblox_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/free-printable-minecraft-coloring-pages_GM479516143.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/roblox-free-robux-generator_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/synapses-roblox-exploit-free_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/hack-de-robux-para-todos-pastebincom_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/awesome-roblox-hacks_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/can-people-hack-you-through-roblox_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/free-robux-codes-2021_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/free-robux-hack-us_GM431946152.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id//repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdf
    • https://digilib-akuntansi.stkip-pgri-sumbar.ac.id/repository/roblox-hack-meep-city_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003341.bin
d9e9a1f0de787373bdf2e5d5829a150726f4404a34bdcc1001111462c766c44f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3341 22844 bytes
font_01_sfnt_off00006691.bin
00dcea7996adecea4359526b2b90529b3c344bba5bd916e9be57b91c8c70a807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6691 19892 bytes

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