Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcd5e8154192c76…

MALICIOUS

PDF

39.7 KB Created: 2020-10-29 22:55:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 7fad74f5c6019a3db8aac10a195810ca SHA-1: 7a22e6bf89e0a597e14cb42e7e3fade1a0218597 SHA-256: 1bcd5e8154192c766a47e194f9109783130d4132b0a992778441da69fe104b95
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to other PDF documents, a technique often used for SEO poisoning or to distribute malicious content. One of the embedded URLs, https://ggtraff.ru/123?keyword=inky+johnson+motivational+quotes, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document structure and embedded links point to a malicious redirection scheme.

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/123?keyword=inky+johnson+motivational+quotes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4414873/normal_5f98d4df27f67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390095/normal_5f9547320e3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369315/normal_5f9a845137ff4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f87090738e37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5f93257724e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f8b6781a7d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5f8db33229627.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420748/normal_5f998fe6e41d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8115/7796/files/voxefepijadejo.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/greenhouse_effect_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7119/9163/files/nature_republic_foot_peeling_mask_instructions.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_off00005e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2D 5196 bytes
SHA-256: eccccf70926f345d8b3c93418d9d9a44e128ee28b8ec1653cc300c92fd047c1d
font_01_sfnt_off00006fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC8 10376 bytes
SHA-256: 93ebc525304b9524d46afa1c41eb5d492087999d6b127d628b421bd5860f1c2e

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