Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e9b7c442594e8b…

MALICIOUS

PDF

42.6 KB Created: 2021-05-11 03:04:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1d13c9d6e3b8f61774148efd0246588f SHA-1: 972381dbebfa8e09619a44c7b4e340036de0d713 SHA-256: a1e9b7c442594e8bc768278501acccd67242a7baa1be8e8c28cb496420abe3fe
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, identified as a link farm, pointing to various game-related hack sites. The primary URL, https://netcdn.xyz/app/406889139/free-links-to-coin-master-game-hack, is likely the initial lure. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/free-links-to-coin-master-game-hack
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/robux-hacks-2021_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/robux-withdraw_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-generator-2021-no-survey_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-free-spins-hack-link_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/roblox-gift-card-for-free_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-coins-coin-master_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-roebucks_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-spin-hack-2021_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-game-free_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/can-you-give-me-free-robux_GM431946152.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-hack-app-ios-download_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-hack-app_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/coin-master-apk-hack-mod-download_GM406889139.pdf
    • http://perpus.fisip.unnur.ac.id/repository/free-robux-gen_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004818.bin
acd1b41316c0dad8a0404e80f2e4d607d57b1c489324acc78aa1395d86a30b79		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4818 26708 bytes
font_01_sfnt_off00008545.bin
1898eeb35173f70b59c84058d9d8580582d84ad8b6feb537a53f23d464b6e221		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8545 17880 bytes

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