Malicious PDF — malware analysis report

Static analysis result for SHA-256 d403146ec2726a15…

MALICIOUS

PDF

41.6 KB Created: 2020-10-28 18:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6d8562a4560bd76945721756a3bec512 SHA-1: 9c6f63dedf8b949428a8a99707d2e3bd298d735f SHA-256: d403146ec2726a15c6426e2e2ada055e061b4f35219a43202c9b57e0c8c26f92
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract search engine traffic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of malicious links suggests an attempt to redirect the user to a compromised site.

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=lincoln+county+missouri+health+department In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385435/normal_5f8d225fdd4ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370054/normal_5f8a9314291e0.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/997cbf5025e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5f8fb1c39e9af.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/8538890.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/roxovilidepebizudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8e2a8f2b77f.pdfIn PDF document text
    • https://mefemanodi.weebly.com/uploads/1/3/1/4/131454269/sisupilakuratola.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5f98c15d54e8e.pdfIn PDF document text
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/b84930ebb5c8cf.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/dopulikowowazatise.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384469/normal_5f8ff4a153d5d.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/971c0af284994.pdfIn PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/doniwajorex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levumoduf/kagoxuvolibuloposoril.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/anna_karenina_book_in_russian.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/algebra_1_homework_practice_workbook_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/computer_knowledge_questions_and_answers_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/81687734923.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/dubewuxosavorufu.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/lolidupetidonogixokiki.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/bronfenbrenner_theory.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/91006218861.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_off000062d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D3 5356 bytes
SHA-256: d880e716d43e18005b03ded100525aeb0650be6695c639d717a82044028b52a3
font_01_sfnt_off000074ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74EC 10588 bytes
SHA-256: 4e8fb1f2a25e2edae45cd2ee552613608f71ec2bb5464fc5b60dd6495fde72ee

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