Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab3dcf0f1ab1879…

MALICIOUS

PDF

45.5 KB Created: 2020-11-04 14:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5927954ea92f81193ad8f772a56078bf SHA-1: 314a5daa5dcc109cdbc314b2124ed23eb25f8d5f SHA-256: 0ab3dcf0f1ab1879791dccd7161ccf12f64e0a23f3ca6f251dbd4dd366c99985
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, masquerading as information about refrigerator compressor noise, which are designed to redirect users to malicious infrastructure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the presence of numerous external links strongly indicate a link farm or redirection attack. While no scripts were extracted, the document's structure and embedded links are sufficient to classify it as malicious.

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=refrigerator+compressor+noise+when+shuts+off In PDF document text
    • https://pigogokeda.weebly.com/uploads/1/3/1/8/131857695/7326fdda0f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382613/normal_5f90a18418f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_5f8acfd67cf0e.pdfIn PDF document text
    • https://jufopikigon.weebly.com/uploads/1/3/4/3/134309667/be472117294b36d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_5f9f24e3be4c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f891e30d0cf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370089/normal_5f8902a300fe1.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://s3.amazonaws.com/taruzudov/peter_sinfield_christian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e68546-0afd-4d54-8365-01e07a8ce8c7/nuzixorozetuwobufelidevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ec2a7e-28f1-4f2f-b7ee-49ceaee878c2/48847575150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82fcb1b2-5bf9-4873-bd9a-d44ac157b5b0/marriage_certificate_affidavit_format_delhi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a945b2-5f60-4f52-a118-0352dc4693b2/midnight_cry_lyrics_gaither.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f6ac77-2608-4af1-8d88-fa3fabf3dadc/41059090361.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_off00006443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6443 5376 bytes
SHA-256: 7a452bd68a7b26e57fe8dabd2356f5db7f3843f30fdd4d9feda9c268ea2bff21
font_01_sfnt_off0000767b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x767B 10540 bytes
SHA-256: afb9b706cae44ac3447e0acf8b6dd792ccc20728b6ec17b92f30fd180d2c3007
font_02_sfnt_off00009a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A81 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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