Malicious PDF — malware analysis report

Static analysis result for SHA-256 68187ca4dd202e86…

MALICIOUS

PDF

46.3 KB Created: 2020-11-04 23:39:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a75f4f251950bf2bc76edc6435416483 SHA-1: 07c184861f0f92598cebe606b4fd92f32fdbfe01 SHA-256: 68187ca4dd202e860059b7fecec31bafaa1e0b2cb30e880b4e5967128561260f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm or SEO spamming attempt. One of the primary links directs to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are consistent with this link farm behavior. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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://gettraff.ru/wb?keyword=ion%20color%20brilliance%20brights%20red%20on%20dark%20hair In PDF document text
    • https://cdn-cms.f-static.net/uploads/4381108/normal_5f905ecf8057f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389376/normal_5f96e66d232fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5f9d6536770cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_5f9297354fbbc.pdfIn PDF document text
    • https://fisalusul.weebly.com/uploads/1/3/4/3/134341538/6313144.pdfIn PDF document text
    • https://lubukapilibuvi.weebly.com/uploads/1/3/4/0/134095968/8236791.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/f49cd8fd-6360-4d78-be40-b1987a00ac37/xonifivowodifajeguzururag.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/1606782448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17906f8c-3c35-42cc-8a59-e91d3e3c8532/94638110704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7009a638-73e9-44db-a6e9-935ed013a1f2/2985633471.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_off000074c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C1 5344 bytes
SHA-256: 9580c0ad98a69e8545e3f55f5da22c2ecd4423859273c902fd49ec55a455e858
font_01_sfnt_off000086dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86DC 11412 bytes
SHA-256: 3f234c99a3b9d2ac75e2f989a583ab947fdf5efa956eb5a955e02afd59afe026