Malicious PDF — malware analysis report

Static analysis result for SHA-256 eceac64142503289…

MALICIOUS

PDF

38.5 KB Created: 2020-11-01 18:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 206a5e4f382bf03afe56d1134aa1b39d SHA-1: d96fc109d9b78f1786913721987b7a3b14d78384 SHA-256: eceac6414250328996d71c73b1369b6cb119634b2f199b960bebd56920ff3003
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://cctraff.ru/strik?keyword=nc+7th+grade+math+eog+practice+test In PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/5833901.pdfIn PDF document text
    • https://zafigitelerom.weebly.com/uploads/1/3/4/3/134338481/6327f61c.pdfIn PDF document text
    • https://pibekexamu.weebly.com/uploads/1/3/4/4/134401786/4425198.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4587/1512/files/59982980324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1565/8401/files/81532754574.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/the_case_for_christianity_lee_strobel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6063/9384/files/7368218484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/6571/3055/files/nisipojitefoxezugi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3019/9495/files/vuseparuvesuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0352/5299/files/mewilam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0337/8335/files/vupesosapalinopekupevon.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_off00004a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A99 5184 bytes
SHA-256: c668f9cf5b3e6798192f39bee420132271a5e5a4ce95755656540b96ad7a64af
font_01_sfnt_off00005c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C45 10276 bytes
SHA-256: f1870fc08efe5898ca60272ee3a27e9a6ba1d3d51553160bf414f888b084023b
font_02_sfnt_off00007f3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F3E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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