Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13629ad59cd036d…

MALICIOUS

PDF

40.1 KB Created: 2020-10-29 17:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f72146fc1035f5df7d78de4d9ac30606 SHA-1: 192d9cad1cd1f23409ac35de227a60e91b67ec64 SHA-256: d13629ad59cd036dd8dded9433b9e6a17dd121331e12c6d156094d4670d30de7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to external resources. One of these links, 'https://ttraff.me/123?keyword=c%252B%252B+tellg+file+size', is identified as a known malicious redirector. The presence of numerous links, including a high volume of PDF links, suggests a link farm or SEO manipulation tactic, likely intended to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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://ttraff.me/123?keyword=c%252B%252B+tellg+file+size In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f982f7408be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5f9370a68cf46.pdfIn PDF document text
    • https://wozuwonasanava.weebly.com/uploads/1/3/1/4/131483955/dbab0b62cef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369904/normal_5f8839c2bcd82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406208/normal_5f97388c3e81b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375700/normal_5f90d38d8e044.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/1/0481/7859/3943/files/nesodapuvojofipapodep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3771/9717/files/paradiso_dante_alighieri.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/oppositional_defiant_disorder_and_conduct_disorder_in_childhood.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/3_phase_induction_motor_speed_control_methods.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5643/7665/files/history_of_modern_design_david_raizman.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_off00005df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF3 4584 bytes
SHA-256: 8c906afe6efd5fe16c453c0689d4481710a61ea4216a643dc5e0c4686d13e020
font_01_sfnt_off00006db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB5 11852 bytes
SHA-256: 585f987ec7ea29545795712c7ae66d36a7ce170162c160ffaabd5cc9fbb2d780

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