Malicious PDF — malware analysis report

Static analysis result for SHA-256 acada1531feb8123…

MALICIOUS

PDF

47.5 KB Created: 2020-11-01 20:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3cc666b9e7a640ee0e761e32d8983577 SHA-1: e58b034cda67f5da4e6a2fe65718dadbb59c99b7 SHA-256: acada1531feb81239f039129ef1329f70276019915cd5b4a6dc97c8b1063b540
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. 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.cc/123?keyword=threshold+frequency+units In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405651/normal_5f96179628bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387052/normal_5f96cdc9bb8ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5f9148b98122d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417216/normal_5f97af24756b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f87c0db4d4f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5f9bcad4d8a1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383571/normal_5f8c2a2192111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_5f94322751d66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_5f97b568077b4.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/tadovu/78599625509.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/johnsons_plan_for_reconstruction_summary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/20427272231.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_off00007ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB1 5076 bytes
SHA-256: 5d63a50c0f9a7e27f2772e6891ca8a16deb9a89ac65aba338a0151b1e971807f
font_01_sfnt_off00008bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF5 11000 bytes
SHA-256: 578e26fbfc135dd2d8734c244e2774dcd39078bd88d28834df468cc0c5250794

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