Malicious PDF — malware analysis report

Static analysis result for SHA-256 396e27f7ee53d8ab…

MALICIOUS

PDF

36.7 KB Created: 2020-10-12 04:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 713f46594b7f82f999cefa2593e67378 SHA-1: 5d40cbca9db8fbd72964634fba8387a4d04766c5 SHA-256: 396e27f7ee53d8abbaadcbf3861b18c24c1f1fa9bb05a5cfccde4bceb1fc8ce9
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external PDF files hosted on various platforms. The primary malicious URL, 'https://cctraff.ru/pify?keyword=andrew+loomis+anatomy+book', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to an 'andrew loomis anatomy book'. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to drive traffic to malicious infrastructure.

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/pify?keyword=andrew+loomis+anatomy+book In PDF document text
    • http://files.scootjoe.com/uploads/1/3/2/6/132680933/nerese.pdfIn PDF document text
    • http://files.ilikai2120.com/uploads/1/3/1/3/131379205/5373371.pdfIn PDF document text
    • http://files.cowcreekranch.org/uploads/1/3/1/4/131437792/sewoziwukalix.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/1/0495/5160/5927/files/vuronade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9772/2531/files/80925993319.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9744/7831/files/baxelorirudedemudajisu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/5489/5782/files/xidadusos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe16a85-987f-4bb9-a7fb-d33b26358724/zokam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d11c41-f159-47a3-9d25-8684d1ee0715/nobuwigepalasasedogajake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31d93bfc-b5f0-4413-b798-4633bd55aea0/74664322507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6e382e-71f6-4391-b872-1a5417a389f6/leviredulolumovetojavasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d673a89-0766-48ec-9d08-42429570e105/deviputiwakawaxuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6694/8773/files/kalajiv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4363/2805/files/wakimakejafibo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1551/0938/files/dilozu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3220/5722/files/michigan_indian_reservations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5404/6618/files/dezapetexafukuzisi.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_off00005189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5189 5360 bytes
SHA-256: ae7c94386a38906daa5d6997d4d084ce6174a34b83cd3aa7c6173b3bd814d06e
font_01_sfnt_off000063ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BA 10024 bytes
SHA-256: 913869c3491a1e55fe9bb8394539eca43915d670a58f4c8a8949c9bb05575eda

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