Malicious PDF — malware analysis report

Static analysis result for SHA-256 107cd6ce32416da7…

MALICIOUS

PDF

43.5 KB Created: 2020-10-21 20:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 1ee40e2d35fc7ca570c774a5acdb5927 SHA-1: 9fc60a311f4c006f03fe2b8bd015d9d59c2a6d0c SHA-256: 107cd6ce32416da78bd4db874eac0ecb11fcf8d141094ff48b39a11b00c07b31
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 files, many hosted on Shopify, suggesting a link farm for SEO manipulation or to distribute malicious content. A critical heuristic identified a link to a known malicious redirector at 'https://cctraff.ru/pify?keyword=android+developer+interview+questions+2020'. While no scripts were directly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially 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://cctraff.ru/pify?keyword=android+developer+interview+questions+2020 In PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/5b04ca83cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374957/normal_5f8b011108618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369486/normal_5f8b76db6be02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369784/normal_5f900bdb1570a.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/1/0502/5041/6306/files/mifosawasat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0623/2229/files/nazefugegubamixa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7934/0710/files/85829167664.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5479/8263/files/88517547824.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/7864/7453/files/wyoming_bank_and_trust_jobs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8534/6998/files/maquina_costura_manual_onde_comprar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4234/6907/files/bokifapijasuvebo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2931/8813/files/40773017420.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9929/4363/files/us_code_of_federal_regulations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/5821464515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5289/8739/files/kendig._enfermedades_respiratorias_en_nios.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_off00006c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C58 5284 bytes
SHA-256: ac4747658d67d32fc7ff87b1750eae81ccbdb0bfb8030d207cdb5134a0bd0cd4
font_01_sfnt_off00007e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E7B 10032 bytes
SHA-256: 87237f598bee4013614caab5c6d2f430669d1bd68c4c9e0556f78499eaa67536

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