Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b09a68464ca0ffd…

MALICIOUS

PDF

39.0 KB Created: 2020-10-31 02:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 0eb36ba6a4474b5c18fdd2292cf28cbc SHA-1: dfab532b81923c5c7c221c7c0a24506510b83178 SHA-256: 1b09a68464ca0ffdb3cdf1ec50f7d291365b73ff1bc74b52c8dea968ebdfdb14
184 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous embedded URLs that redirect to external sites. One of the primary URLs, 'https://cctraff.ru/aws?keyword=code+name+verity+online+pdf', is flagged as a malicious redirector. The document's structure and the presence of many links suggest an attempt to lure users to potentially harmful content, likely for phishing or malware distribution. No scripts were extracted, but the PDF's nature points towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=code+name+verity+online+pdf In PDF document text
    • https://goxezojukaruvuk.weebly.com/uploads/1/3/4/0/134000107/pizuvekuwolow.pdfIn PDF document text
    • https://mujetuzavos.weebly.com/uploads/1/3/4/2/134266282/tebomelorotev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376875/normal_5f8cbc1c59b8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_5f9c8f8940801.pdfIn PDF document text
    • https://gukijofajileraw.weebly.com/uploads/1/3/4/3/134392650/c0d011b78c.pdfIn PDF document text
    • https://juleladenoduko.weebly.com/uploads/1/3/4/4/134478401/mogikarapodebugowafu.pdfIn PDF document text
    • https://vavagufone.weebly.com/uploads/1/3/4/3/134345741/caf6bbbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f884c8814405.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374002/normal_5f9caa8d2f711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380079/normal_5f8f8d6dec907.pdfIn PDF document text
    • https://lefedatit.weebly.com/uploads/1/3/0/7/130776734/a69c05c32f7aaa8.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/1/0504/4597/5729/files/ragagaridaxizuso.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_off00005b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B41 5076 bytes
SHA-256: 831cb7f44b73b551082fba4321ac04e8cd5857b9a3482df09edeab11538e6899
font_01_sfnt_off00006c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C79 10176 bytes
SHA-256: 835ee3beb556fc271a30632b33a54afafb234efab0e0550e902f8da0c286482f

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