Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef4e14fb992a370d…

MALICIOUS

PDF

41.4 KB Created: 2020-10-01 21:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5e99358eb34fdfa3e3f5f03f7933084d SHA-1: 30f57d5099b5153a9828c02f9e6360281612fcf5 SHA-256: ef4e14fb992a370dc0edefe7abf613386839b2eaae48e32a3e75f71f1a50f180
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs that are likely part of a link farm or SEO spam campaign. The primary malicious URL identified is https://gettraff.ru/strik?keyword=ate%25C5%259Ften+g%25C3%25B6mlek+pdf+%25C3%25B6zet, which is likely used to direct users to malicious content.

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=ate%25C5%259Ften+g%25C3%25B6mlek+pdf+%25C3%25B6zet In PDF document text
    • http://files.yakimatietonirrigation.com/uploads/1/3/0/9/130969440/firetuguzev.pdfIn PDF document text
    • http://dapura.backtobal.com/uploads/1/3/0/7/130775085/432643.pdfIn PDF document text
    • http://files.nastockdogassociation.com/uploads/1/3/0/7/130775728/1fde448e4e32df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3674/0264/files/blue_crab_grill_waynesboro_ms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/jafodi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2630/3134/files/drury_inn_bna_airport.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0565/9296/files/vitaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0908d33e-e39d-44a9-b8c6-069ce2ad6ac5/8794969647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/mazupakulesodafimetonoto.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/exponential_utility_function_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0712/2342/files/95192187407.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6563/7019/files/samsung_rf30hbedbsr_manual.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_off000062b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B2 5368 bytes
SHA-256: 3f2a5ef67737c960695481ee8ca47e1bdbb177ef35b4f6c16051239fe4868069
font_01_sfnt_off000074bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BB 11096 bytes
SHA-256: f01bbb7578a681ce899468325a8a6160cf3f9eaa038a1aa0f3f927db7a6af80b

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