Malicious PDF — malware analysis report

Static analysis result for SHA-256 326556b85323dfa0…

MALICIOUS

PDF

42.1 KB Created: 2020-11-08 04:18:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: b96c7f0a9076af9f3959ba818abb5b88 SHA-1: bc42672a201594012bbdcfb7258d1e380ebbc852 SHA-256: 326556b85323dfa05abb360731be3223f1ad79783d7b2d949ded8a8f8f6f2ddc
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, containing numerous external links to other documents. One of these links, 'https://gettraff.ru/123?keyword=genesis+baptist+church+sacramento+ca', is identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence, indicating malicious intent. The presence of a 'download button' lure further supports a malicious workflow, likely aimed at directing users to malicious content or exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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?keyword=genesis+baptist+church+sacramento+ca In PDF document text
    • https://mujetuzavos.weebly.com/uploads/1/3/4/2/134266282/5821972.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/5769995.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/d3cacc6a-90be-4fb1-a7d4-b3e37fb4d711/21207291825.pdfIn PDF document text
    • https://xanaledevevi.files.wordpress.com/2020/11/jovidalijadaxobizipexojag.pdfIn PDF document text
    • https://nifesewuwa.files.wordpress.com/2020/11/64392657516.pdfIn PDF document text
    • https://nizowowe.files.wordpress.com/2020/11/midesifitir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1399e70-6bb6-4220-b09c-b90b50f89ae2/words_starting_with_letter_p_for_kids.pdfIn PDF document text
    • https://tigenarer405571806.files.wordpress.com/2020/11/74772623234.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/att_employee_referral_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b2823f-807a-4a43-873d-f16a45cfee40/situdiromuwikepir.pdfIn PDF document text
    • https://dabuvosejo.files.wordpress.com/2020/11/vajekapa.pdfIn PDF document text
    • https://vapijaroti.files.wordpress.com/2020/11/90950053825.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_off000064a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 5312 bytes
SHA-256: 4ff064dcb2ccf7d5b4437424681ac34c34432e95e59742b93b1dc8a032bfd49c
font_01_sfnt_off0000768e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x768E 11200 bytes
SHA-256: 48105564116369bf6aba911197a1d35b5a54843809ae1682119a617d32936914

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