Malicious PDF — malware analysis report

Static analysis result for SHA-256 20fd839ff6fd5fca…

MALICIOUS

PDF

62.4 KB Created: 2020-09-03 09:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a393e457d4bcaa9b77e3f173b5198e0f SHA-1: 8831892e2ecd477ef95bcbbe7f4941b05f424399 SHA-256: 20fd839ff6fd5fcacab74f6549b35a8b4635930e8891a4841f736821893d97ab
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'ttraff.club', which is also listed as an IOC. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm SEO tactic, likely to improve search engine ranking for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.club/wix?keyword=hansgrohe+ibox+installation+guide
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/xutavawibigoziwavanara.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/kindle_book_format_type.pdf
    • https://cdn.shopify.com/s/files/1/0429/5737/3589/files/zedobezofupumejajataxez.pdf
    • https://cdn.shopify.com/s/files/1/0435/7154/4225/files/94430298159.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/situnefezutawifemakekomir.pdf
    • https://cdn.shopify.com/s/files/1/0436/5362/8062/files/how_to_draft_a_basic_bodice_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36281161478.pdf
    • https://cdn.shopify.com/s/files/1/0439/8232/3870/files/91680682253.pdf
    • https://cdn.shopify.com/s/files/1/0468/9559/5682/files/csv_to_vcf_vcard_converter_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9024/files/bewoperesela.pdf
    • https://cdn.shopify.com/s/files/1/0432/6899/7284/files/consumer_reports_best_car_seats_for_toddlers.pdf
    • https://cdn.shopify.com/s/files/1/0434/0980/1365/files/easy_keto_meal_plan.pdf
    • https://cdn.shopify.com/s/files/1/0429/7277/4556/files/karobakobisitifusigalexo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b743.bin
77a0472795dd78b1620afd3ace642f215a98d068695945932ff3bc9093ee56ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB743 5256 bytes
font_01_sfnt_off0000c918.bin
58038ad72adaae56ac858aa54edaf4f7f396f48f7863bdeae5794f0da8aa3224		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC918 10420 bytes

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