Malicious PDF — malware analysis report

Static analysis result for SHA-256 622981b4581b739f…

MALICIOUS

PDF

66.0 KB Created: 2020-12-20 23:59:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 61886182a67651639840b11c6c09bd67 SHA-1: 1a10668e80d951bd29285eef72f236af7d51a8e6 SHA-256: 622981b4581b739f4cb95b3fffa026a76747e5c6cf78e4d1c38572c26b72a759
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/strik?utm_term=foosball+game+rules In PDF document text
    • https://runigofotizete.weebly.com/uploads/1/3/4/4/134433234/tuviz.pdfIn PDF document text
    • https://jiketajaw.weebly.com/uploads/1/3/4/4/134464131/sowowir.pdfIn PDF document text
    • https://lonunibulitog.weebly.com/uploads/1/3/4/4/134498578/e8a9d4b1f3.pdfIn PDF document text
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/efd04ba0b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc172a2084698658e621db3/t/5fc2819a64571256548d4ae8/1606582685577/rufemijaroxugumimiworobu.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/82013381692.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd2c445b7bc966055df433/t/5fde7ae6ef735726d25c386e/1608415974755/60286970621.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/imslp_prokofiev_romeo_and_juliet_suite.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/bejaxifejewavavivufonoz.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/kukopovifejax.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/activation_code_for_office_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/bikebuduvud/gogilafatapizosuv.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/words_that_begin_with_stop.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf572dcb3e0f57714677a2/1606375213904/45550418653.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_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 5100 bytes
SHA-256: c1eda2ad554c97340381a134bc18233acc60801e1742a7e171db6eb15da49557
font_01_sfnt_off0000d963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD963 10012 bytes
SHA-256: 694adbf8a5165e93393b5178329af53d61459d66891f0a7e12f730da5fa8d62b

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