Malicious PDF — malware analysis report

Static analysis result for SHA-256 29d6ec2bee64b7e6…

MALICIOUS

PDF

40.6 KB Created: 2020-10-02 15:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e37b261392e75893930404c4cfe22d12 SHA-1: f3742a325f087570991e4ea0f22ae663827cc3f9 SHA-256: 29d6ec2bee64b7e66861e698a0a536b1c74ab4a083c2eabddbcfa5d94a8261b3
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to external PDF files hosted on various domains. One of these links, https://cctraff.ru/strik?keyword=bhakti+yoga+pdf, is identified as a malicious redirector. The document's structure and content suggest a link farm designed to drive traffic to potentially malicious sites, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

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=bhakti+yoga+pdf In PDF document text
    • https://site-1036639.mozfiles.com/files/1036639/julifol.pdfIn PDF document text
    • http://sixomover.galwayplayers.org/uploads/1/3/1/4/131453808/aaf25e7b67b6c.pdfIn PDF document text
    • http://files.utahskillsusa.org/uploads/1/3/1/3/131379830/471130a4f04.pdfIn PDF document text
    • http://files.linkhornparkpta.com/uploads/1/3/1/3/131398281/8121906.pdfIn PDF document text
    • http://files.dsslearningcommons.ca/uploads/1/3/1/6/131606550/vemepogiramu.pdfIn PDF document text
    • http://piminiw.globalvillageschool.org/uploads/1/3/2/6/132680903/lakuloke.pdfIn PDF document text
    • http://xakapo.thepeacefulhealingtree.com/uploads/1/3/1/8/131856554/gewunogipoxibelobir.pdfIn PDF document text
    • http://majab.hutchmade.com/uploads/1/3/1/3/131383510/dejedobigapesume.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/1/0480/2664/8735/files/wuzedexe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5491/5488/files/dublin_city_school_calendar_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4652/9941/files/38114875911.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7279/8373/files/kamijogebadadudol.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_off00006152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6152 5212 bytes
SHA-256: 5b50ece31df4cc38824b7819950647eb2c305d95aa6c73f4fc42528343a05831
font_01_sfnt_off00007327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7327 10288 bytes
SHA-256: 94b2764b5c5d4a342b45b7f4695543b35a2bbf805d7f81464d4119cc5029735c

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