Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7ca41607a5d99b…

MALICIOUS

PDF

56.7 KB Created: 2020-08-14 20:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b2a530c34f284607be20e98bec778ed SHA-1: cb1ca030339bd1c1f03bf4584e8aecc2908bf6d0 SHA-256: 7b7ca41607a5d99b8cd26b6e96159bbeb989a900e203032c10282ed784ed841c
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a malicious redirector link disguised as 'End of school report card comments'. This link, 'https://ttraff.ru/pify?keyword=end+of+school+report+card+comments', leads to known malicious infrastructure. The document also functions as a link farm, containing numerous external PDF links, many of which point to Shopify domains, likely to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ttraff.ru/pify?keyword=end+of+school+report+card+comments
    • http://files.charisvocals.com/uploads/1/3/1/1/131164100/cb4279e01.pdf
    • http://kofumuf.shinermotorsales.com/uploads/1/3/2/7/132711973/49c28ac.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/7057477500.pdf
    • https://cdn.shopify.com/s/files/1/0430/3188/8035/files/lixakilajenanaguge.pdf
    • https://cdn.shopify.com/s/files/1/0454/8486/7736/files/95598018024.pdf
    • https://cdn.shopify.com/s/files/1/0434/6806/2872/files/fuzopepeze.pdf
    • https://cdn.shopify.com/s/files/1/0438/2185/8973/files/65322402302.pdf
    • https://cdn.shopify.com/s/files/1/0437/9534/9666/files/what_are_webhooks_used_for_discord.pdf
    • https://cdn.shopify.com/s/files/1/0433/9000/9502/files/45509860186.pdf
    • https://cdn.shopify.com/s/files/1/0432/5975/6708/files/98346666224.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000961d.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x961D 2828 bytes
font_01_sfnt_off0000a018.bin
479301d81f3502e1b78fadaf12689f5a97f8c7b7d2ce7842b5dfff748f7e5dd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA018 5352 bytes
font_02_sfnt_off0000b221.bin
c72a9171233075bb830e064e2135f13891a1f283082520e83dc9a56254eef40a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 10420 bytes

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