Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc93b4f16e2ccf1d…

MALICIOUS

PDF

49.4 KB Created: 2020-10-27 22:22:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: df84bd1cb78ac49e2e955a1c2e679eaf SHA-1: 7aeabd2be1f26db3d564abf99c6f33037ef5f164 SHA-256: bc93b4f16e2ccf1d3ceecd1a6a5dda11aa792e7181c166afc31a7153c8bec7b1
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the heuristic findings, suggesting a lure to external malicious content.

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://ggtraff.ru/strik?keyword=love+and+other+stories In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365539/normal_5f8703b12d1b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370767/normal_5f8c5cf822602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_5f91433164f31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_5f95732ed4c2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_5f8e2df750a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418747/normal_5f95a7dbc27df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f915c20b9d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391624/normal_5f90007165ada.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f881084cfc65.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/8fedaa61-72a2-4233-a7ee-7780023604a8/66336362932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac2a9fc0-f705-4b42-8c62-50a4e875b1cf/64170034786.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3692/4826/files/32324712114.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/6520/4636/files/ispoofer_equivalent_for_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/tafevegijojepit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2818/4739/files/67123177575.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2044/3045/files/bamij.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/56531585728.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/electrical_engineering_textbook_download.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_off000084c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C0 4884 bytes
SHA-256: de37bd628cd2826cf8273f6c58c9596db9091b6b6df9fda008b1342b9870967d
font_01_sfnt_off00009558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9558 10276 bytes
SHA-256: effa07db227f32f7064181f916ca23fc5c9d7e797bf41b581c1b27ad440a156b

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