Malicious PDF — malware analysis report

Static analysis result for SHA-256 359fa4fc1f5c767d…

MALICIOUS

PDF

46.0 KB Created: 2020-10-22 23:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 48a443fdf1532453c0545ffdab71a90a SHA-1: 9f4f0304b1ef9da9096c017cf3bf17660835ad5c SHA-256: 359fa4fc1f5c767dbfbe28836ab25ea219c2628ca9ffe022b24a4065e6b6a0d1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, many pointing to disposable hosting. One critical heuristic identified a link to known malicious redirector infrastructure. The document body contains obfuscated text and URLs, suggesting an attempt to disguise its malicious intent, likely related to SEO manipulation or redirecting users to malicious content.

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://ggtraff.ru/123?keyword=android+version+names+and+dates In PDF document text
    • https://lixaworone.weebly.com/uploads/1/3/1/8/131871871/tibot.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/9276785.pdfIn PDF document text
    • https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/6997757.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/towinokivos_pelejefemevuva.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/808062.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/nukunuraki.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/fb376f985fda90.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/7e3bbe9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/5176/8766/files/research_proposal_on_performance_appraisal_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9359/7601/files/android_x86_download_6.0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1442/1150/files/childish_hoodie_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sugowubuf/risk_management_and_insurance_book.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/15647619359.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02844ae7-9068-4d63-a1c8-bd76a978b78c/vogiritonan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26981d5b-d056-4315-8786-01d664ec5df6/47946540800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cf513be-1d1c-438e-a183-aea13d760e9b/keranakonipezato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779c029a-412c-4ca9-9756-28ef4648c855/duladomusef.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_off000076ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EA 4988 bytes
SHA-256: 40a1f2e635aed49b8b9fb2994ae24e0266df4511fe80a70ea17bcd57cfc7bf4a
font_01_sfnt_off000087cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87CB 10332 bytes
SHA-256: 2d82af13cf876f7cbe24d830872811668dd499694cf745bfe3c3ac879fe00cbe

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