Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d54ccf6a412a20…

MALICIOUS

PDF

41.9 KB Created: 2020-08-24 22:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0d2e87c814fe7a2cf5d0de06f5c65c3 SHA-1: f9d7b5e9f3fbdc81abe00bceb2aedcd1069de368 SHA-256: b4d54ccf6a412a20a28ab8610121566627ef093f8a4b5021788f7f8dac5d131a
150 Risk Score

Malware Insights

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

The PDF contains a link farm with 12 external PDF links, many of which are hosted on Shopify. One of these links, and the primary link in the document body, redirects to a malicious URL (ttraff.ru). The ML classifier strongly flagged this PDF as malicious. The presence of a link farm and a malicious redirector suggests a phishing or malware distribution attempt.

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=companion+planting+vegetables+pdf
    • http://ronuviwof.camelliayang.com/uploads/1/3/2/8/132814930/692aa8736c37fbc.pdf
    • http://givat.walkinginthewordministries.net/uploads/1/3/0/8/130873738/a915a4.pdf
    • http://files.guysalvidge.com/uploads/1/3/0/7/130776484/3943736.pdf
    • http://files.colhenryart.net/uploads/1/3/2/7/132740633/c5664.pdf
    • https://cdn.shopify.com/s/files/1/0427/8291/6767/files/unix_commands_with_example.pdf
    • https://cdn.shopify.com/s/files/1/0437/1644/4311/files/lefad.pdf
    • https://cdn.shopify.com/s/files/1/0432/7967/9656/files/fuxuweputudanagaxo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0916/0862/files/83162022720.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/scholarship_application_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/6680/9765/files/23127879156.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/33950075704.pdf
    • https://cdn.shopify.com/s/files/1/0463/4755/0882/files/5574577056.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006632.bin
997169bef0d2a17ccd273dcaf1410c7076b35d534f9bc704ffb161e74ff6e1f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6632 5368 bytes
font_01_sfnt_off0000785e.bin
5e7a88ab1557e04cfd8a5a731812c655afe7dbb8d31abc7fb8fc25b97a3b324b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785E 10044 bytes

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