Malicious PDF — malware analysis report

Static analysis result for SHA-256 e958ed15f03005a1…

MALICIOUS

PDF

50.1 KB Created: 2020-10-13 13:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: acb175decd7d450dcff9b4b7aae8071c SHA-1: 1eae9feba5444d38a1c9bd805dc8da508cbc5b9a SHA-256: e958ed15f03005a1e847f7856d20128f4fadc9dbc3e0b71cc6c2b181dfea238f
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to manipulate search engine results and direct users to a malicious redirector. The embedded URL 'https://cctraff.ru/strik?keyword=riesgos+laborales+pdf+definicion' is flagged as malicious. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to labor risks, likely intended to trick users into clicking the malicious link.

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/strik?keyword=riesgos+laborales+pdf+definicion In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kirorafagosox.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/caa64.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/rugatu-rugot.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/5b76a2a4-8686-49f1-91ee-1c9a45a967b8/misitikozatozututabo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e264d9de-2e65-4735-b8ed-39271f3c1277/94937509498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b7312b8-68df-48f8-b168-fa95538073c3/bubarazogukumesosudilu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e0c6b8-9dcb-4574-8ec2-0a7d79920133/kajipumenunuzat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8010/9218/files/portfolio_planning_tools.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0037/5707/files/enthalpy_of_reaction_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/1403/7919/files/arduino_programming_lessons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2609/5540/files/segofeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/2263/1067/files/string_thong_swim.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_off00008340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8340 5472 bytes
SHA-256: e179ea346d6f3f0169ff83f818a4514e5d9ecd4c409af3e10170a4c41f48044f
font_01_sfnt_off000095e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95E1 11256 bytes
SHA-256: 3bd61af0b08830e4f286b77a5645496b614ea849e06d9bad912e8150fa106edf

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