Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4202a57db770c4f…

MALICIOUS

PDF

45.2 KB Created: 2021-05-12 03:34:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fddba29129c2789d953c9c4307129389 SHA-1: c86375b3af847f94d3954709f449c7e39e030025 SHA-256: e4202a57db770c4f8ba108df062490baf73da4a0885a9b0dc93f788077321419
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results. The presence of a 'download button' lure and the ML classifier's high confidence score indicate a malicious intent. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to potentially malicious content or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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/coin-master-link-game-hack
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-free-link-facebook_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/free-spins-and-coins-com_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/minecraft-sign-up-free_GM479516143.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/get-free-minecraft-account_GM479516143.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-app-hack_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/can-you-get-minecraft-for-free_GM479516143.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-cheat-codes-free_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/hack-coin-master-no-human-verification_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-free-spins-generator_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-free-spins-hack-without-human-verification_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/free-spins-coin-master-links-blogspot_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/roblox-free-clothes-girl_GM431946152.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-hack-download-ios_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-cheat-apk-free-download_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/wurst_GM479516143.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/free-coin-master-game_GM406889139.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/minecraft-windows-10-free-with-java_GM479516143.pdf
    • https://mariyadl-elearning.usmart.id/__statics/gudangsoal/files/coin-master-game-hack_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a6c.bin
ab050afdf5dd1e9655b7a1b9382bd5ae16388770d78964edf417df1bd2e88f15		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6C 24920 bytes
font_01_sfnt_off000083b9.bin
1dd933c112880b232546f3aab6a17784a8f412d39fd551cc6eb31c5a04c3ce57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B9 3380 bytes
font_02_sfnt_off00008fa2.bin
6b6be525affa70ffc107ac4c88dd9d04ef97920621a7989faf1a85e6391895c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FA2 17716 bytes

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