Malicious PDF — malware analysis report

Static analysis result for SHA-256 65947dc1a86aee68…

MALICIOUS

PDF

42.7 KB Created: 2020-10-02 01:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cd25ae927e963038ca7ea2958def0ccc SHA-1: e1e2bf7dde29e8d7c3e173aed51186189f6a4782 SHA-256: 65947dc1a86aee68bad00f2cbd3cde8170e989f71da944a938c1d9c766e17227
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links to external PDF files, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, suggesting it's part of a larger malicious operation, potentially leading to further exploitation or malware delivery.

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://ggtraff.ru/strik?keyword=parent+child+attachment+scale In PDF document text
    • http://files.microbladingbyz.com/uploads/1/3/2/6/132681308/dotat.pdfIn PDF document text
    • http://gotebomed.megjordanart.com/uploads/1/3/0/8/130874482/9798075.pdfIn PDF document text
    • http://duxagofu.steptemecula.org/uploads/1/3/0/7/130740597/pusobakewukenos_firof_favulenexi_wexirotiz.pdfIn PDF document text
    • http://tukejuk.eosfinancialplanning.com/uploads/1/3/2/6/132682871/kepevupukel_maxafe_kemupepub.pdfIn PDF document text
    • http://lutatudu.dothemission.com/uploads/1/3/0/7/130738732/a3e18fe.pdfIn PDF document text
    • https://site-1036848.mozfiles.com/files/1036848/mujoxofika.pdfIn PDF document text
    • https://site-1036995.mozfiles.com/files/1036995/41978374967.pdfIn PDF document text
    • https://site-1038460.mozfiles.com/files/1038460/badewafi.pdfIn PDF document text
    • https://site-1037111.mozfiles.com/files/1037111/231560039.pdfIn PDF document text
    • https://site-1038669.mozfiles.com/files/1038669/60031623086.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cee4d55-08d8-4db4-b2d9-5e4dd1467f4e/3802505493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea2e994e-1d62-4369-a189-a381047651a0/2774134153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcd73736-55cd-400b-a489-bdafc7dc6bc8/tanikukuvikepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4455/9258/files/39319079785.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/bibubugepodosapudisub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5889/2452/files/goodnight_goodnight_construction_site_read_aloud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/norman_rockwell_figurines_saturday_evening_post.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/8154/2053/files/simulated_beadlock_wheels_8x6.5.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_off0000695b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x695B 5180 bytes
SHA-256: 20796d7de3a79d38d321ae23c04dd75c9d0b05fb0a89dc132dbacfc341435aa1
font_01_sfnt_off00007acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ACB 10204 bytes
SHA-256: 5275dbaf3a5454ae060562ad0eacda68ae574e54f70252e412ec4e226f21467a