Malicious PDF — malware analysis report

Static analysis result for SHA-256 bacc8d83ada0a8cb…

MALICIOUS

PDF

77.0 KB Created: 2020-11-20 22:18:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 560576a44d79f77fa23aaaeaa17a0968 SHA-1: 38f2d06b2cdbc6c45d42ecc38175eebadc9dcf8f SHA-256: bacc8d83ada0a8cb1833808c1250d40fe9e92cff53d7e8824a1972c7276d0b9b
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm. One of the primary links, 'https://gettraff.ru/123?utm_term=shawnee+public+schools+shawnee+oklahoma', points to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates the document's purpose is to generate traffic through a mass of external links, potentially for malicious SEO or phishing purposes. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=shawnee+public+schools+shawnee+oklahoma In PDF document text
    • https://purusoze.weebly.com/uploads/1/3/4/4/134495244/maguwiluxonisor.pdfIn PDF document text
    • https://somisesi.weebly.com/uploads/1/3/4/5/134523690/6869880.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366958/normal_5f8c3d8fd11f7.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/3a0f7c0a-523d-4b80-879e-8bdfe050da5e/respawnables_apk_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfa425e-c41c-494e-a97a-719fc856875f/avogadros_law_formula_example_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18b94612-913d-4292-a0ed-4fa4bc94e525/buspirone_dosage_15.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd013108-fe17-40d1-a903-dbe835cf2408/driver_s_license_manual_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/nanerirogimemololubosaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ee4283-7f8a-482c-8e45-621171ce5bd4/soul_calibur_6_xianghua.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/public_records_property_lien_az.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fb7f747-f33e-49d4-8244-bee0c86c7157/demunopatafinasoxaxinaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c7431b6-496f-4e67-8f30-de851e097cf0/walmart_employee_training_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0826fc-cc54-41ba-8795-a3ca562e2b89/68345042813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75af54a2-d4dd-4e31-8ed3-7b58ad3c6ab1/vawasupedojopijovajoxowap.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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 5476 bytes
SHA-256: 76961852f1d27595ffa92e35b863bb3188709c21f0500fc2bac0a21ca0a1770d
font_01_sfnt_off0001021b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 10800 bytes
SHA-256: 504258e8aaa057d325f76f82c2e08b7189c675f96e2307f4d1388a4179858fea

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