Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e90e45bf3f82abf…

MALICIOUS

PDF

44.9 KB Created: 2020-10-30 20:50:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3df578d93f7316218484f04146c5ff5f SHA-1: d81e7cc8d7b03281b0054fcaf0a56603e22afc63 SHA-256: 8e90e45bf3f82abf38894f201ebf1900294e71d81415706ca6dc11a825abc1d4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

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=the+great+chain+of+being+macbeth In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f895ed51eb78.pdfIn PDF document text
    • https://medefanitinov.weebly.com/uploads/1/3/4/3/134386417/joniwijiredusir-panawavopaxob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f90b5d21036c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_5f9931e166c66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_5f8e5312ce1f8.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://uploads.strikinglycdn.com/files/d3f209d8-0046-4288-afa2-6f9bfa262a70/8590704432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f244e889-2b84-4a18-a2f1-ff175471fcfb/lakodigipofimipukaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc5628cb-d8af-4245-ac1c-113e1109dfa9/tudesamazapekevew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7150/7098/files/water_genasi_monk_names.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2607/8106/files/comprehensive_medical_terminology_5th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7299/5996/files/84576385038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce32e21-a556-4197-8e91-8f9ceb68a1b1/binomial_probability_distribution_so.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4142/0979/files/ipad_mini_user_manual_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5254/0319/files/que_es_el_enanismo.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_off000064e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E0 4964 bytes
SHA-256: 51e3616873d2db5e00d9eaef97b88e5719c68e368169fafd5939ec168107f60b
font_01_sfnt_off00007595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7595 10288 bytes
SHA-256: ea3f5ec160827302978278b118f28077878bbeb1ae24e72fea502cfc7d61d2aa
font_02_sfnt_off000098cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98CF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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