Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b86dd5d103b577a…

MALICIOUS

PDF

47.4 KB Created: 2020-10-01 05:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d135a67e3ec07fca266de0e0f2b29b32 SHA-1: 7e34324ec8d505aeec4400b0537580b6f61579c8 SHA-256: 8b86dd5d103b577a5c1f5e9de8bec0a9e02828a060a63e3113f207b4dfbedcd1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting PDF files, likely as part of an SEO link farm. One of these links, however, directs to a known malicious redirector. The ML classifier also flagged this PDF as malicious, indicating a high probability of malicious intent.

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=whittaker+analytical+mechanics+pdf In PDF document text
    • http://files.shaikheskander.com/uploads/1/3/0/8/130873989/wimepipo.pdfIn PDF document text
    • http://vakisir.laclassedemonsieurjerome.com/uploads/1/3/1/4/131406115/vabovurekevijuk-viguvi.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/1/0428/1463/6198/files/ocarina_of_time_3ds_strategy_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/drdo_ceptam_09_notification.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0879/2475/files/adventurous_sentence_formation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4472/3098/files/critical_thinking_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/2993/7566/files/file_b_kha.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/7697/4747/files/34457816060.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0352/6820/files/89637875885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0885/5711/files/febek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5244/9444/files/mozemowodipazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/alan_greenspan_book.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_off00007ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CED 5576 bytes
SHA-256: 17c977eddc6e3e8856a72f69df4837314ebc08b603e5eb89e78d11c31b181df5
font_01_sfnt_off00008fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCF 9776 bytes
SHA-256: ee2f77be9232b519fe2ae0878494974496456e070e1c85b889a11612fc3e265f

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