Malicious PDF — malware analysis report

Static analysis result for SHA-256 15bf4601b72b1d15…

MALICIOUS

PDF

43.8 KB Created: 2021-05-12 11:36:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9429253de25fd03fbc11f24cea7336ad SHA-1: 2640bdfada9fd7faa34e27ebc23a23768405c038 SHA-256: 15bf4601b72b1d15bb154bf6ac343a0c98d281c486090bab9a016e2550f14fb1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to SEO spam pages related to gaming and free items. The document's content and structure strongly suggest it is designed to drive traffic to these sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the presence of numerous external links indicates a malicious intent to redirect users. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/how-to-hack-people-on-roblox-game-hack
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/windows-10-minecraft-hacks_GM479516143.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/free-robux-net_GM431946152.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/coin-master-unlimited-spins-apk-free-download_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/coin-master-blogspot-free-spins_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/free-spins-for-coin-master-on-1-19-19_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/coin-master-free-cards-link_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/roblox-com-free-play_GM431946152.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/free-spins-for-coin-master_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/free-coin-master-gold-cards_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/coin-master-mod-apk-unlimited-spin-download-free-full-version_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/coin-master-hack-blog_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/today-free-spin-coin-master_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/roblox-premium-free_GM431946152.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/facebook-coin-master-free-spins_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/coin-master-hack-online-pc_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/coin-master-free-coins-and-spins-app_GM406889139.pdf
    • https://lpm.umi.ac.id/asset/ckfinder/userfiles/files/coin-master-free-spins-link-2021-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a6e.bin
45a6eca02a134b6d301d303c9c84ed64831f8640280b44467305ed1b93322b95		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6E 28136 bytes
font_01_sfnt_off0000877e.bin
9439cdf519c477105af26a237b903c28353edd649090bb99f856962d56c9ecd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877E 18676 bytes

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