Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67a6cc56b11446e…

MALICIOUS

PDF

55.4 KB Created: 2020-10-08 16:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f21f31b1657a30824fc2dafc1de0229e SHA-1: 997b8b86e662412aa01ab6ea4b6c198d85f9abb3 SHA-256: f67a6cc56b11446ebe49fe7dd347e1a5bd05282efcb4a1e409a33123383fce67
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to disposable hosting, characteristic of a link farm. One of these links, https://cctraff.ru/strik?keyword=cuadro+comparativo+de+los+navegadores, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of a malicious link distribution scheme.

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/strik?keyword=cuadro+comparativo+de+los+navegadores In PDF document text
    • https://site-1038313.mozfiles.com/files/1038313/73046965616.pdfIn PDF document text
    • https://site-1036764.mozfiles.com/files/1036764/74719934417.pdfIn PDF document text
    • https://site-1038750.mozfiles.com/files/1038750/44046166777.pdfIn PDF document text
    • https://site-1039765.mozfiles.com/files/1039765/53917481595.pdfIn PDF document text
    • https://site-1040136.mozfiles.com/files/1040136/18927442188.pdfIn PDF document text
    • https://site-1036721.mozfiles.com/files/1036721/67990549305.pdfIn PDF document text
    • http://files.allamericandoorofindiana.com/uploads/1/3/0/8/130814342/moxov.pdfIn PDF document text
    • http://revopoki.houdinguyen.com/uploads/1/3/1/4/131406925/wopew_nutowizolu.pdfIn PDF document text
    • http://mogejefed.workplays.com/uploads/1/3/1/8/131872055/1dbaa.pdfIn PDF document text
    • http://sudemo.newhealthbydesign.com/uploads/1/3/1/3/131379117/a7a20a.pdfIn PDF document text
    • http://xezag.breedigs.com/uploads/1/3/0/7/130776271/renuzob-xeremag.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/585c2862-1e44-4b9b-8ecd-986d47d28ee2/49025200491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f47af5d9-76b2-41d1-8813-18ab4a002c95/xenitiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb761472-d96c-4bba-be6f-7cf80293287e/bakadebaxoli.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_off00008935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8935 5356 bytes
SHA-256: b035d3685ea1463bd725a596a3314dd21c7fec60329f4b6059e2b41725824871
font_01_sfnt_off00009b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B5A 17036 bytes
SHA-256: 3b03c062bef4279579a91347976c141abf07c285a51fed050e390032697f99b9

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