Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf1fa33869d25f0…

MALICIOUS

PDF

47.2 KB Created: 2021-05-17 10:05:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6e35838f2a4137fa4c380cf175ace2e7 SHA-1: 5281fd3289719f10aac2e0b5c1bd4d398408e099 SHA-256: ecf1fa33869d25f0aa36b0320854c829c5b000c7a584e7e14af60a5bcc55d909
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links to external PDF files, many of which appear to be SEO spam related to games and free currency. One primary URL, https://netcdn.xyz/app/431946152/roblox36.com-free-robux-game-hack, is also present. The ML classifier flagged this PDF as malicious, and the presence of a link farm suggests a potential attempt to drive traffic or distribute further malicious content. No scripts were extracted, but the structure indicates a likely spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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/roblox36.com-free-robux-game-hack PDF link annotation
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/coin-master-spin-hack-link_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/you-promised-my-son-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-free-coins-and-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.ksmt.edu.np/assets/ckfinder/userfiles/files/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA8 25380 bytes
SHA-256: 36fa55be052283c843e2fbba2212e20378feca528b59d7fb72db2345b096ce36
font_01_sfnt_off00008a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A6F 3016 bytes
SHA-256: 4c3e2db5174821787a4569c9da4979555510caebd15fb9cea35573c139e242bd
font_02_sfnt_off000094d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94D3 18756 bytes
SHA-256: 75a7293df35b739ae2294dba45007dab7b7658b4df7c6a7e046c10781a1fd260

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