Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7c8b77aac1fafd…

MALICIOUS

PDF

46.1 KB Created: 2021-06-07 08:24:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0fb7832b53a2e73231997a81ff938dd5 SHA-1: 325ddaaffcee87305d2fabfbec576e17cd297c7a SHA-256: ef7c8b77aac1fafde83fbf7254209c6c6802e8fa9f69bf2accd7f78736e6fa4d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, identified as a link farm, pointing to SEO-optimized pages. One prominent URL, https://netcdn.tw/app/431946152/how-to-use-game-hacker-on-roblox-game-hack, is embedded in the document body and also appears as an external URI. The heuristic PDF_SEO_LINK_FARM indicates a mass of external links, suggesting a traffic generation or redirection scheme. While no scripts were explicitly extracted, the presence of embedded URIs and the nature of the link farm suggest a potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/how-to-use-game-hacker-on-roblox-game-hack
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/get-free-spins-on-coin-master_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/free-coin-and-spin-for-coin-master_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/get-free-spins-coin-master-october-2021_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/free-minecraft-hacks_GM479516143.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/free-coin-master-spins-daily_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/mc-update_GM479516143.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/free-robux-without-verification_GM431946152.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/coin-master-game-android-free-download_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/how-to-get-free-roblox_GM431946152.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/is-minecraft-free-on-pc_GM479516143.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/coin-master-free-daily-spins-and-coins_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id/repository/free-robux-without-verify_GM431946152.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/rbx-gg-free-robux_GM431946152.pdf
    • http://perpus.poltekkes-tanjungpinang.ac.id//repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005056.bin
2806e23c31e4eb5216c7bf4a53ed79fae8a618471cfbc7849a76797bb7a1daf7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5056 27720 bytes
font_01_sfnt_off00009021.bin
175a8d29e30acd8dcb2e80150c63b5a2222898763972fa907cae099cd6234cfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9021 18792 bytes

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