Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a4a6ad9aa72baa…

MALICIOUS

PDF

47.0 KB Created: 2020-10-03 10:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 21a06db8c8d242b62874e60403c98e98 SHA-1: 33de827861d5f49742f2178fc9a4005112c1a5b7 SHA-256: 44a4a6ad9aa72baad6d5f91014cfc4ab10dd964892b7bbe354e571bd98fcd0c8
194 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=madeira+embroidery+thread+conversion+chart+pdf In PDF document text
    • http://xosebix.iambornmade.net/uploads/1/3/0/9/130969916/jabozo-pafotevil-rutebaba.pdfIn PDF document text
    • http://files.pentrack.org/uploads/1/3/1/6/131606291/f0016d78.pdfIn PDF document text
    • http://files.instar-program.org/uploads/1/3/1/4/131438823/lagagijowufuze.pdfIn PDF document text
    • https://site-1039494.mozfiles.com/files/1039494/90550059102.pdfIn PDF document text
    • https://site-1036767.mozfiles.com/files/1036767/nugigutin.pdfIn PDF document text
    • http://files.travelingaboutandbeyond.com/uploads/1/3/1/0/131071043/1e42b3921.pdfIn PDF document text
    • http://files.odbweldingwerksfab.com/uploads/1/3/1/3/131384516/wejosoxo.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/1/0429/9243/5359/files/porozofedujale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4928/6813/files/special_right_triangles_questions_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1197/8902/files/go_math_grade_1_answer_key_chapter_9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8889/8973/files/the_cretan_bull_and_pasiphae.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_off00007732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7732 5672 bytes
SHA-256: 245590e8a5fb6f3d7cb39a55b3d9e8cc768d801dc02df4f692087f87f9e0b89f
font_01_sfnt_off00008a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A66 10796 bytes
SHA-256: 296b58bfe0fe4287c99671187dac3cefa0a6aabe42b4947103490c6e11700ddf