Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19b08a969a5dcdc…

MALICIOUS

PDF

40.7 KB Created: 2020-10-03 09:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1eb64a2debec03ee33532ffc2af3268b SHA-1: 590230a82662dfd7b76bcf346277f59f84f92f28 SHA-256: d19b08a969a5dcdc9a475700bc37a9e56f384e864a5f3ee4c7e75dede65423bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are part of a link farm designed to redirect users to malicious infrastructure. One critical heuristic identified a link to a known malicious redirector, and another flagged the PDF as a link farm. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious redirection scheme.

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://ttraff.link/pify?keyword=themes+in+a+streetcar+named+desire+a+level In PDF document text
    • http://mufeg.aadistrict0490.org/uploads/1/3/1/4/131453853/3460159.pdfIn PDF document text
    • http://files.starfyresilkenwindhounds.com/uploads/1/3/0/9/130969079/6580008.pdfIn PDF document text
    • http://files.restorehousemn.org/uploads/1/3/0/7/130775354/zujowizipefu.pdfIn PDF document text
    • http://files.eastbrucemanufacturingltd.com/uploads/1/3/2/3/132302759/zotewa.pdfIn PDF document text
    • http://files.chapmanbostonterriers.com/uploads/1/3/0/9/130969477/3278009.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/e1a0b18d-7cf9-40fa-870b-a44807bbcc84/lesagarujajapariso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce31d5f0-6af4-40ef-8836-105ecceabc2b/64926234099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/900c7b09-3842-4318-b460-435c8310917d/jedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49989734-a1a9-4789-be58-a2f6f092bb87/52543638363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4a378db-ee2b-4484-b2e0-2d836eafbcab/fipezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a17c9a-45ed-4ecb-bf3f-72722911d827/zusuzinudesal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6b244d-3a96-4cc0-a4cc-64313727d6cc/48572202203.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d03dfd54-fd59-4280-b3e4-c4aa3d87d777/suvepiliwudosizumimubel.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_off00006330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6330 5188 bytes
SHA-256: 9d24629e78c337793f4b5200b97dbda1bc64509b33311d121cb0cc0738566fc6
font_01_sfnt_off000074a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A5 9808 bytes
SHA-256: 19cae97a336a29ec08acd2c4c9276ebade256260a46b1919b09fba9327156131

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