Malicious PDF — malware analysis report

Static analysis result for SHA-256 d231d4b8150da573…

MALICIOUS

PDF

32.6 KB Created: 2020-10-01 15:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5e49f9c1cc35c324616a47db77c2698e SHA-1: 19edebdd6c981abee34ffcf0e584b588fc52fc77 SHA-256: d231d4b8150da573a83a5e971e582a36775eecfccda6cfdcdb901931c414d4b3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or link farms designed to host malicious content. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, indicating a deliberate attempt to drive traffic to potentially harmful sites. The ML classifier strongly flagged this PDF as malicious.

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=catia+v5+workbook+release+19+pdf In PDF document text
    • http://jotipez.elisetrelegan.com/uploads/1/3/2/6/132680799/1869951.pdfIn PDF document text
    • http://files.b-kool.com/uploads/1/3/1/4/131453559/kexadix.pdfIn PDF document text
    • http://files.aidanteplitzkymusic.com/uploads/1/3/2/8/132816041/9426393.pdfIn PDF document text
    • http://files.bruceevansartwork.com/uploads/1/3/1/3/131378771/risinof-jukatiwi.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/1/0483/3378/3203/files/selanukokezekaba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5024/6054/files/13173748357.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2304/6555/files/kameb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5530/7159/files/fernando_valenzuela_jersey_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1865/8207/files/the_last_stand_union_city_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c14339a-a1bf-4787-ab10-530457356a66/robebubiwodenup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047c124a-057d-4e3a-9738-5c224e5f0b95/vizulugarivisan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfbd8e69-4a1a-47b0-a5c9-2048fd842567/77196043171.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_off000043a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43A1 5628 bytes
SHA-256: d53dd4475828ba7fd7895c284d18734db812ae2fcd71159a09ad86b0084d3e27
font_01_sfnt_off000056f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56F1 9140 bytes
SHA-256: 065bee5583c4f6eca88ea3f2770b1edab557403d1ed7d11606856f05c6092cc9

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