Malicious PDF — malware analysis report

Static analysis result for SHA-256 271a698ef2d3aaeb…

MALICIOUS

PDF

74.9 KB Created: 2020-10-04 18:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e61db0a08eb24f57bb9d5a47918791e2 SHA-1: f0d1b16c7ce1564612f3e09ae0285c89f154948f SHA-256: 271a698ef2d3aaebb2224d5c21d60973a65f259d6c6a48f58d6ff28c1bd2429a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://cctraff.ru/strik?keyword=multiple+choice+study+guide+quiz+questions+where+the+red+fern+grows', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other PDF links, many pointing to external sites, indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cctraff.ru/strik?keyword=multiple+choice+study+guide+quiz+questions+where+the+red+fern+grows In PDF document text
    • http://files.asianwildcattle.org/uploads/1/3/1/4/131453615/roxojatuzate-gefobofap-wedirumakeg.pdfIn PDF document text
    • http://toxipabe.chagcreations.com/uploads/1/3/0/7/130775209/7585321.pdfIn PDF document text
    • http://files.stmarksdalton.org/uploads/1/3/1/4/131411197/3218385.pdfIn PDF document text
    • http://bogew.barcfriends.com/uploads/1/3/0/9/130969264/363dbad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/661acf93-1b84-4fe1-b229-7f4093527e87/5528707323.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2bd9c7-afb1-44e7-95fb-b06d8b5dd2cb/sipadoroz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54a046df-a9a6-4ca7-9082-019556c5b497/76366496968.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6738b4b2-b400-44c7-81ea-212f5bdc8418/65016892172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d664b92b-0b1c-4938-851b-ddcb5db96da9/64692761091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1619/0112/files/1691688548.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1712/5544/files/87505374141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2980/2403/files/chc_mng_sinh_nht_ngi_ln.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/most_poisonous_spider_in_the_us.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 5580 bytes
SHA-256: 37c345f68d0f480587b335d6ddaa6ed14045639d951915dd5ed7ffbd9825c2cb
font_01_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 11636 bytes
SHA-256: 44c38850cd852149f340db04db7dae5a8d53bf45eb96ec2dffb6622ec525b93b

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