Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80c918bdd35e0e3…

MALICIOUS

PDF

43.3 KB Created: 2020-10-30 15:59:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c1bc2fe0257c6066b37b9af0c4146b48 SHA-1: 85b8bc5c2aa3830847d6b0930991890717ed0ea8 SHA-256: b80c918bdd35e0e3a48ba00085eaea08eccf3514383bdf1fa31ea66e26762436
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 link farm designed to redirect users to malicious infrastructure, specifically identified as 'ggtraff.ru'. The presence of numerous links to other PDFs, many hosted on content delivery networks, suggests an attempt to obscure the malicious destination and potentially leverage SEO techniques for distribution. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious redirector campaign.

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=prairie+dog+pet+store In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368977/normal_5f87f130421c7.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/1/0432/5031/9517/files/79200558835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd5aa95f-71ab-4cb9-b923-123027e82e87/355796374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0362/3585/files/wishes_level_b2.1_students_book_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9447/2856/files/2305937121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c692169-4aec-4c30-9790-753b70cae616/barna_trends_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e54821-c86a-4c5f-a278-a3c8f2258616/xixiro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0771/9603/files/linksys_wusb54g_driver_windows_8.1.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6006/4156/files/81566290734.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_off000069c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C4 5096 bytes
SHA-256: ba40e59fcb410e9c1b986b1e1528d2a25ef447ca008059ea3d026bddc643e6c1
font_01_sfnt_off00007b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B25 11140 bytes
SHA-256: ba6698f6549579a1f956aea70991bbc52d88f0b40c9d91f5a4c4f8ae12abb3a2

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