Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c87ca210d339e98…

MALICIOUS

PDF

66.9 KB Created: 2020-11-01 02:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 30230842694c6115d19faadebb92a827 SHA-1: e1548870910277194f43f18563b7a5d917a50dc4 SHA-256: 9c87ca210d339e98eba524f77dc003077cf995b545ed28fe0998b5cef584be0f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a link disguised as a student guide answer key, which redirects to malicious infrastructure. The ML classifier strongly indicates maliciousness, and the PDF is flagged for linking to known malicious redirectors. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit vulnerabilities or trick the user into navigating to a harmful 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/123?keyword=a+long+walk+to+water+student+guide+answer+key+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f95d031917be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f88d95e2d059.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/56c3891f-d6e2-4a16-b29e-babda0b4390a/fasitapabedevagoxunewu.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/jegeneladatirajimilef.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/lefifawovafono.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/76467315667.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/to_whom_it_may_concern_capitalised_uk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/6927/4782/files/26305074343.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/46821044059.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/berudilali.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/algebra_and_trigonometry_4th_edition_robert_blitzer.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/38234276098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/021196d6-8e54-47f1-a9f9-d782cc9c7ee0/izim_dersleri_perspektif.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/sanidipegubatafovu.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/ap_human_geography_agriculture_test_answers.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_off0000c6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EA 5456 bytes
SHA-256: 5fa04ee9081ebb1ec3cbb57fa2a30222b046b3dae681dcbeb0158a84e94674d8
font_01_sfnt_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 10660 bytes
SHA-256: b42de2745dc0bfb7c36b4a99d343123ba00ae3f2f6e52cc1c921599b7cb04386

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