Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9eb6eb4874acf6…

MALICIOUS

PDF

41.0 KB Created: 2020-10-04 12:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 38c3237d2f0b066e0be245e941a8f209 SHA-1: 8f4e27548fd035def70556e6e29ac44c4c082c15 SHA-256: 8b9eb6eb4874acf63948a47c7f2422110403e49158ca65039e076df2bc96c534
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and contains a large number of embedded URLs, forming a link farm. One of the primary URLs, 'https://gettraff.ru/strik?keyword=tissue+epithelial+characteristics', is identified as a known malicious redirector. The document body itself is heavily obfuscated and contains a mix of text and what appears to be encoded data, along with several URLs that likely lead to further malicious content or phishing sites.

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://gettraff.ru/strik?keyword=tissue+epithelial+characteristics In PDF document text
    • http://fukam.nativenationarts.com/uploads/1/3/1/4/131438188/3914715.pdfIn PDF document text
    • http://sorase.jmontanaphotography.com/uploads/1/3/0/7/130738697/vugele-dejuzoro-zevopuna.pdfIn PDF document text
    • http://kidavufi.packerlandpickleballplayers.com/uploads/1/3/0/7/130738848/27f945ce5097a0c.pdfIn PDF document text
    • http://files.kanestoyhunt.com.au/uploads/1/3/1/3/131384468/tobobodav-lovuvoseta-kapuzomimawovu.pdfIn PDF document text
    • http://files.thines-talks.co.uk/uploads/1/3/0/9/130969659/0d124ab3cb24.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/a36b466e-3084-4a76-b072-ef2f259c3df2/saverujaludimali.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dd77df3-b1a8-4ed2-809f-feaa246311ac/vekolojasagajewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f51c884-47d9-4932-a3de-dc920e9dfa66/40898274009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990265ef-36ba-4f4f-8058-c92cab5c9c1c/50663166754.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/pasabalagamilawuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2414/6855/files/vapulojukinuvogutewutamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6414/4284/files/monawesa.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_off000065f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F0 4968 bytes
SHA-256: 4275611e7888a24e2354f3b7efbd28f9e70b83cb2d319005dff70dfcbf456a6b
font_01_sfnt_off000076cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76CD 9604 bytes
SHA-256: 72cf758c930526a4f49b6825124456dd203151a8b5320a21ec2d6ba48061492d

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