Malicious PDF — malware analysis report

Static analysis result for SHA-256 98cd2def1bedf0da…

MALICIOUS

PDF

40.4 KB Created: 2020-08-13 08:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9aeda4e4e78c21f73a48a265a562b635 SHA-1: a58abb53f555454098c74ea89b599cba95c57a9e SHA-256: 98cd2def1bedf0dad7dbfab18dfecc80e04aeee9e3de7c4a52ae497b129a074a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains, which is indicative of a link farm. One of the primary links, 'https://ttraff.ru/wb?keyword=amann%20girrbach%20steamer%20x3%20manual', is flagged as a malicious redirector. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, likely to disguise its malicious intent. The ML classifier strongly supports the malicious verdict.

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/wb?keyword=amann%20girrbach%20steamer%20x3%20manual
    • http://files.minebricks.com/uploads/1/3/0/9/130969080/ccd188d0ea55.pdf
    • http://gigar.oceanbreezeadventure.com/uploads/1/3/1/4/131413418/e946b5a460.pdf
    • http://files.documentsresearch.net/uploads/1/3/1/6/131637635/704ca.pdf
    • http://files.whitneyelliottphotography.com/uploads/1/3/2/6/132683264/gemugijerisowev.pdf
    • https://cdn.shopify.com/s/files/1/0438/4971/1781/files/how_to_write_a_character_witness_letter.pdf
    • https://cdn.shopify.com/s/files/1/0431/3025/7568/files/32307864048.pdf
    • https://cdn.shopify.com/s/files/1/0434/9798/0056/files/suzalosoto.pdf
    • https://cdn.shopify.com/s/files/1/0438/9902/7611/files/juzezulekuse.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vixegenosevisime.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/76077050424.pdf
    • https://cdn.shopify.com/s/files/1/0435/5004/8420/files/mifedulemivafoted.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/attack_on_titan_crimson_bow_and_arrow.pdf
    • https://cdn.shopify.com/s/files/1/0439/0869/4171/files/acido_urico_en_orina.pdf
    • https://cdn.shopify.com/s/files/1/0440/4215/8245/files/pexetuvalowune.pdf
    • https://cdn.shopify.com/s/files/1/0432/4494/5571/files/lutetab.pdf
    • https://cdn.shopify.com/s/files/1/0437/5740/4318/files/bronchiolite_cours.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_off00005eee.bin
bebb2e0551746691e8f6201c9ab5b5ca0e1e8b24ba025ce50a253ade7e6fcdad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEE 5572 bytes
font_01_sfnt_off000071b2.bin
f8e72c3e5870a50ae0e23f17a96b84521ba556c72389c33240681a7546ad5dfe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B2 10220 bytes

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