Malicious PDF — malware analysis report

Static analysis result for SHA-256 0689d574d1700135…

MALICIOUS

PDF

35.1 KB Created: 2020-10-05 11:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 334ce2688d8db727294cafbfa91e1755 SHA-1: 7f85869001f324c513e2b74a9ac33a18e2b530d1 SHA-256: 0689d574d1700135e1c573dd06e63ce26ab27d262571eca15f79591608bca52e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify-hosted PDFs, likely as part of an SEO link farm. One of the primary links, however, redirects to a known malicious domain, cctraff.ru. This suggests an attempt to lure users to malicious infrastructure, potentially for further exploitation or phishing. No scripts were extracted, but the presence of numerous links and a malicious redirector indicates a social engineering tactic.

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=a+view+from+the+bridge+monologue In 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/1/0483/9407/6318/files/abas_3_scoring_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3728/0414/files/azul_airlines_baggage_allowance_international.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/5954/2947/files/leah_homeschool_letter_of_intent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1301/2641/files/96660622517.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9967/1714/files/black_and_decker_weed_eater_18v.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/ap_intermediate_exam_fee_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8758/5699/files/vepilivobisudo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3206/7739/files/game_of_thrones_season_3_episode_4_parents_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8029/7895/files/nifidibanel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/19532943448.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/9557/6742/files/75516490538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/79962713475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1207/7206/files/50564362300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35533c34-8b7e-4a1a-a57a-4b231d99e35e/95789550192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2ac5db-8105-452b-93d0-50ee9d5d2f56/xosorekikipo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02423cb-6f06-4275-b4ea-03ba2e5cc553/7892816137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0e5cf52-f493-4436-a53d-d0841b355786/dujejebigoromoseruwure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b1b48e-5dfb-44ee-94da-64bf5d2a47df/93159187500.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_off00004b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B65 5216 bytes
SHA-256: 977164d2f45bc0e5d35793d56048bc90ed44d641836376e13e52532d4bc41aa6
font_01_sfnt_off00005d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D12 10024 bytes
SHA-256: e038df5b346a06e855af6acadcbd55716ed0de45447da8050aaf88cbab2b375a

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