Malicious PDF — malware analysis report

Static analysis result for SHA-256 4203907de8f7f875…

MALICIOUS

PDF

39.1 KB Created: 2020-10-25 08:39:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 8458e858d4c4bd57b70708ea17eca12d SHA-1: 63b0a40547fcaf67488d05779e0bc43a2159f5bc SHA-256: 4203907de8f7f8757f9d259c59672b13bff86e482ab1f9fd351eafd309d462ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically `https://cctraff.ru/strik?keyword=marvel+contest+of+champions+crystal`. The document body also contains this URL and other links to Shopify and AWS, suggesting a link farm intended to drive traffic to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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=marvel+contest+of+champions+crystal In PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/1559815.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/5806971.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/49b698af23.pdfIn PDF document text
    • https://salofapaj.weebly.com/uploads/1/3/4/3/134314320/0734b6e5.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/1/0480/3798/6463/files/cheap_android_phones_in_uae.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7296/0708/files/2020_john_deere_gator_825i_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7127/7718/files/the_color_of_water_study_guide_packet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdfdf021-b333-45b3-809f-a2ec038e0376/juxakeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a6cfcd-0874-4dfe-b540-1ef8b950727b/24696840842.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/aistear_early_childhood_curriculum_framework.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/tenusetoseroloseziwot.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/25637696088.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/gofozijom.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/bimal_mitra_books.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/chicken_farming_business_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/sewing_to_sell_book.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/19473436679.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/tazofajujo.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_off0000587d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x587D 5420 bytes
SHA-256: 0c0649c0b50c0ec8b8a196200e453ec89b1be4fb1657a8d3f02dd8111be26ce1
font_01_sfnt_off00006ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE1 10692 bytes
SHA-256: 2cbed0282d366992d671973bd90ffeb4353dac7694f258f221d3fe1240db0de7

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