Malicious PDF — malware analysis report

Static analysis result for SHA-256 725193bb92cb44b2…

MALICIOUS

PDF

61.8 KB Created: 2020-10-31 18:36:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 877cf43fd1b0beb5f96a9f0552cab6ec SHA-1: de1a5501bc0e333dd84a3116738a16e5f5794a0e SHA-256: 725193bb92cb44b2397bca0ffa8b7f5562c11810678a83dde40aba59eb428696
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, a technique commonly used to create link farms. One of these links, 'https://gettraff.ru/strik?keyword=paradise+lost+english+lyrics', is identified as pointing to known malicious redirector infrastructure. The majority of the links lead to other PDF files hosted on cloud storage, suggesting a coordinated effort to distribute content or potentially lure users to malicious sites through a chain of redirects.

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=paradise+lost+english+lyrics In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jumedemimo/sociolinguistics_janet_holmes_book.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/wolf_in_white_van.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9689/4357/files/xebonavifonupejinagowanob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c3fbc6-bea8-43a1-918a-b0e9f4a0800c/47049597207.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/42275161033.pdfIn PDF document text
    • https://s3.amazonaws.com/gidibesuxi/auto_body_repair_technology_by_james_e._duffy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51e321a5-7443-42cc-8725-a3ef3e1347a4/gunevipel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963a4fcd-85b2-4e6e-bd0a-219937d2e22e/53874918533.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/dioses_griegos_tatuajes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7849/3379/files/azitromicina_covid_19.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D45 17924 bytes
SHA-256: 69f0adf9902996e9633247f3157a66200396f068fa8a61135b52a51c054faa86
font_01_sfnt_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 5304 bytes
SHA-256: 06cb639da46bc668e8fff2ca0a08ea540d16a43d5921262e9f02971776d78c6a
font_02_sfnt_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 11272 bytes
SHA-256: 6d1c9a5e5e57b47c320a129716ddb36d64bb77b2d0f9e84248bb4c50893361f5

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