Malicious PDF — malware analysis report

Static analysis result for SHA-256 fec9c7f3e838aba8…

MALICIOUS

PDF

37.6 KB Created: 2020-08-16 21:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b89e05f3f783ac32eccb70e07ceabafb SHA-1: 5e0345bc34d582f4d55fa9cb0c67fc02eda4a8b1 SHA-256: fec9c7f3e838aba812ce4a84a0539524e6f1bffc9451a29a0e7e197b2f55e119
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, suggests a lure related to a 'weather report'. The PDF also contains a large number of external links, many hosted on Shopify, which is flagged as a PDF_SEO_LINK_FARM. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=mannarkkad+weather+report
    • http://files.nmcaaehs.com/uploads/1/3/1/4/131483138/44fcb.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/71860519475.pdf
    • https://cdn.shopify.com/s/files/1/0437/0772/8023/files/dibizagirevanokezolus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/43243161412.pdf
    • https://cdn.shopify.com/s/files/1/0432/3924/3931/files/21403503890.pdf
    • https://cdn.shopify.com/s/files/1/0439/3969/2699/files/lifirifinuzeremiwupopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/gre_vocabulary_list.pdf
    • https://cdn.shopify.com/s/files/1/0428/6044/5855/files/fabogu.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_off00004a0b.bin
c6e23a7d37e5741c56153e1ffb1f5233aca9da2ef80ae65eb6a91363929f453d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A0B 4740 bytes
font_01_sfnt_off00005a21.bin
1667c142949f5c78bcbbddd9f193445a789448cf4ca166155ef15eed09a08c17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 9912 bytes
font_02_sfnt_off00007bf0.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF0 4324 bytes

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