Malicious PDF — malware analysis report

Static analysis result for SHA-256 49505bd584537b98…

MALICIOUS

PDF

37.9 KB Created: 2020-10-05 21:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2418ef34102798a6864cef3ff9cc6ce2 SHA-1: 6886f537687d6c0d87ffa4735c4e9398178ed541 SHA-256: 49505bd584537b98769593eaf8960be255780dac3947e62eec470f7d5280f4b9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. This indicates a likely SEO manipulation or phishing campaign designed to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=will+going+to+present+continuous+exercises+pdf In PDF document text
    • https://site-1036737.mozfiles.com/files/1036737/32105463719.pdfIn PDF document text
    • https://site-1043353.mozfiles.com/files/1043353/33772909968.pdfIn PDF document text
    • http://feweriviv.yellowstoneartboutique.co.uk/uploads/1/3/0/7/130776492/3059279.pdfIn PDF document text
    • http://mesus.louisashomemades.com/uploads/1/3/1/4/131438216/240403b.pdfIn PDF document text
    • http://wafow.purewhiteproductions.com/uploads/1/3/2/3/132302846/bisibuwutigikip-labaves.pdfIn PDF document text
    • http://files.dannaassoc.com/uploads/1/3/0/7/130740589/fijeseboke.pdfIn PDF document text
    • http://xefogez.alzubilaw.com/uploads/1/3/1/4/131453143/doxukuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8be2e0d-f113-434f-9bef-c77fc664b36a/27491790198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d66c1318-7208-476f-9ab6-fb0641624c1e/65817151297.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc09ca8e-8e36-48b2-94b6-156c98ea03ad/kilaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60563a3d-cc3c-48fb-b5b1-defb09614c83/xozasizisebojejeka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3669/6995/files/indesign_file_damaged_error_code_4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2571/0752/files/13827364550.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/7414/4406/files/gradient_of_vector_field_calculator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6342/7751/files/poe_witch_builds_beginner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2182/0319/files/ieee_southeastcon_2020_paper_submission.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_off00005647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5647 5192 bytes
SHA-256: d052d3da356a14736c933dba5e56e01f74e263b4ec213e0375f6ccd521ae83b7
font_01_sfnt_off00006821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6821 10028 bytes
SHA-256: 93fe1b45efd971d81c1677d3344703601504b375e232e85c80a35db3e7c5f67f

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