Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55b961281c08f6b…

MALICIOUS

PDF

63.3 KB Created: 2020-10-29 16:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4ec1ef0ea4d1a640fc12d4417f9bbfbd SHA-1: c7de169f51a85e5306a9781bcd0e6085a3991b48 SHA-256: c55b961281c08f6b9477b0d725a78c15add4bd2abe1deac9d16ca1f25671c2ae
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be part of a link farm designed to manipulate search engine results. One critical finding is a direct link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a malicious intent to redirect users to harmful 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://ttraff.com/123?keyword=estudio+biblico+hasta+que+todos+lleguemos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5f9740c3c5cec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_5f8cec722be7d.pdfIn PDF document text
    • https://vozuzuxe.weebly.com/uploads/1/3/4/3/134314749/xomob.pdfIn PDF document text
    • https://buximinolid.weebly.com/uploads/1/3/1/3/131381316/dc660e4.pdfIn PDF document text
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/musub_noxevatug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5f916074dcea2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f8a305a91d62.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/kewuxejikiwe/60585731335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40d87487-6240-4eca-a1d6-7a07d2f3fad9/reralujut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5723/2034/files/fivikubop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8981/2374/files/fududumufemusiju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6011/7152/files/14554932128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acec33a-c98a-40f8-ab68-f3ec1a25a521/36315441169.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_off0000b482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB482 5480 bytes
SHA-256: da633736dffb1fae50a0d26babc5e487f11c5edc07f92d646dffbdcfdf7e1d0d
font_01_sfnt_off0000c6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F9 13220 bytes
SHA-256: 1e76ed700d8efc19ff77b41ad6ebcfdb6bf64b122b977ffb81db24109411176e

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