Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f56e115846422e…

MALICIOUS

PDF

48.0 KB Created: 2020-11-02 21:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5f434319ed903a125b2888fe75f146f5 SHA-1: b36b7f6cd478d4628681790cca45acdb1920b6ab SHA-256: 84f56e115846422ee8c17baa27fb5e0970d08f16b1a41926d36b73a1bf2dab9d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to S3 buckets and other file-sharing services, which is characteristic of a link farm used for SEO manipulation or distributing malicious content. One critical heuristic identified a link to a known malicious redirector, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect the user to malicious infrastructure.

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.cc/123?keyword=expedient+definition+synonyms In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5f91319402328.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/wilugugo/misenogizotunowufuji.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/wiwiparobofig.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/aa_step_2_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/fowikorejodi/40547959688.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/14947982385.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/kixev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66d30178-4257-4eb0-be15-02deaab441d2/download_kingowm_org_salesforc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/3974/9801/files/zajoxomimaselafuxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7156/0616/files/triple_tree_coffee_grinder_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a432e3-a10f-45a5-926b-11250c7ae494/97989410028.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_off00007c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C0E 4976 bytes
SHA-256: c25316c9553b91d665d764a98bc3badd6ab12794e2aa59c37ab4f3f173d07763
font_01_sfnt_off00008d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D06 11268 bytes
SHA-256: e650d7409d69af48b0cfeb331a82b8a73ddc0bd1e2001ebec6fc722ea493d370

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