Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f5a1ef12b614d2e…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 12:29:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 93664ba8548de4625140f932ee979ae8 SHA-1: ed0d549948d0895750e6b8a579687baef759c84b SHA-256: 2f5a1ef12b614d2e6d71fe3a00ca38bc58c664b43425a1a6d54ec08d28f7730b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, identified as a link farm, pointing to various external resources. The ML classifier strongly flagged this PDF as malicious, and the presence of a 'download button' heuristic suggests a lure. The primary attack pattern involves directing users to potentially malicious external sites, likely for malware distribution or phishing, disguised as links to free spins or game hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/coin-master-free-spins-link-2021-april-game-hack
    • http://e-library.dharmawangsa.ac.id/repository/free-account-roblox-with-robux_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-apk-download-for-android_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/mcpe-master-coin-hack-apk_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/500-free-coin-master-spins_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdf
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-link-spin_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/cm-daily-spins_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/pokemon-go-free-hack-download_GM1094591345.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-roblox-gfx_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-shirt-templates-roblox_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-com-2021_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdf
    • http://e-library.dharmawangsa.ac.id/repository/best-free-roblox-outfits_GM431946152.pdf
    • http://e-library.dharmawangsa.ac.id/repository/hack-coin-master-dzooka_GM406889139.pdf
    • http://e-library.dharmawangsa.ac.id/repository/minecraft-pe-free-download_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f86.bin
fe157119c2656d4830c71591f14775b9e0dec1984b26191e084894069f39a334		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F86 24636 bytes
font_01_sfnt_off0000875e.bin
552a781c635be2f1783b3430facdc17a6d9e208cae7d98c52d6673c33e385b16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x875E 18532 bytes

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