Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fa6342afd21adc…

MALICIOUS

PDF

35.0 KB Created: 2020-10-01 06:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2cbe57e51a99584f1f302e95ae260628 SHA-1: 642f02421b1584d85cb427e19690d6ab218ccdd5 SHA-256: 08fa6342afd21adc7b36a2a69e9317212af495ef8da331a0f3ba9503466b9c74
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains strings that appear to be search queries for technical books, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a malicious site.

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 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://ggtraff.ru/strik?keyword=thinking+in+java+6th+edition+pdf In PDF document text
    • http://timila.cuisineinspired.com/uploads/1/3/0/9/130969744/9654764.pdfIn PDF document text
    • http://files.rodanthesurfshop.com/uploads/1/3/1/6/131637385/zekavupozuxozesibij.pdfIn PDF document text
    • http://pivovu.gordonstounartandphotography.com/uploads/1/3/0/7/130738948/mowazeworat.pdfIn PDF document text
    • https://site-1038578.mozfiles.com/files/1038578/48204024105.pdfIn PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/lorabenafu.pdfIn PDF document text
    • https://site-1037906.mozfiles.com/files/1037906/lojuwaketunagu.pdfIn PDF document text
    • https://site-1037262.mozfiles.com/files/1037262/maxazakebogekuki.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/1/0429/3279/7603/files/50914325141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5801/2068/files/19613964911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0454/1018/9480/files/reliability_analysis_cronbach_alpha.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6641/6534/files/zesodoninunizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4e412d-f4ff-4177-86dd-f7ea51f6ce87/92637674222.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff2c17e-40f6-46fe-bb9b-769e32ad6274/zijipefi.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_off00004c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C09 5300 bytes
SHA-256: 3306506cb19e54d162b32995ec84ecd296fafec3bd86b304c042630e7b4beba1
font_01_sfnt_off00005e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E23 9644 bytes
SHA-256: f2e62d6f3bd97e56e60ec2229ad18a5b4a1b1761928f235865603befe13e2afa

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