Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b4b968b31d2b6e…

MALICIOUS

PDF

41.2 KB Created: 2020-10-11 11:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df6aa477c60f3e78811b523a0ff846f9 SHA-1: cf863a5b84dbef5193f57916c1266cd42a86737f SHA-256: 03b4b968b31d2b6e90bbd3a1da0ea7368b269038afb1a8029a909cc733044218
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically to 'https://cctraff.ru/pify?keyword=how+to+calculate+producer+surplus+from+a+table'. The document body, though heavily obfuscated, contains references to this URL and other links hosted on disposable domains, indicating a phishing or scam attempt. The ML classifier strongly supports the malicious verdict.

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/pify?keyword=how+to+calculate+producer+surplus+from+a+table In PDF document text
    • http://selugixi.constructionqualitycouncil.org/uploads/1/3/1/4/131408056/xukupumuzawuwa-kirevofij-gumivibokodomu.pdfIn PDF document text
    • http://vexow.viviembellish.com/uploads/1/3/0/7/130738964/wemapozuxonerizunex.pdfIn PDF document text
    • http://files.ybcakesandmore.com/uploads/1/3/0/8/130874391/dupavupu-nemaxuruf-nowaru-xudogozazugik.pdfIn PDF document text
    • http://files.futsalwithoutborders.org/uploads/1/3/2/3/132303229/jatokusarojid.pdfIn PDF document text
    • http://files.reikiwomb.com/uploads/1/3/0/7/130738531/ditilo-wifozo-zelez.pdfIn PDF document text
    • http://files.drenzidesigns.com/uploads/1/3/1/4/131453220/4097725.pdfIn PDF document text
    • http://vazibubus.belizehistorysjc.com/uploads/1/3/1/1/131163782/1300528.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/1/0497/7603/3943/files/95649268498.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4073/0007/files/53638058141.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4605/1744/files/crystal_lake_cafe_azusa_ca.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6713/8460/files/71932763402.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/best_buy_cedar_hill_number.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_off0000618c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x618C 5492 bytes
SHA-256: 3da13760347fdddb9f413c1996daed5aea3c7e93c9e7861ac39f3142950d1a53
font_01_sfnt_off00007426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7426 10508 bytes
SHA-256: 1540c38971bca16b664bfdaad8e6ae7524d6a8359117190018d9d2a1d15a12f8

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