Malicious PDF — malware analysis report

Static analysis result for SHA-256 796ce43b84adab77…

MALICIOUS

PDF

38.9 KB Created: 2020-10-04 18:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c3c670a3151f92af4d39652691fcaee2 SHA-1: d92c135a93da209a0aeb7452ddfc885822639164 SHA-256: 796ce43b84adab7766ad9589625c0c889352a3735a71b1d6244ada41a7ab48e2
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting, and at least one known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though obfuscated, contains URLs that are also present in the embedded link farm, suggesting a coordinated effort to lure users to potentially harmful sites.

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://ttraff.link/pify?keyword=mount+rose+pass+weather In PDF document text
    • http://files.restonlibraryfriends.com/uploads/1/3/1/4/131437242/3846740.pdfIn PDF document text
    • http://jisusot.tmulder.studio/uploads/1/3/0/7/130739142/bafiromiton.pdfIn PDF document text
    • http://tusejof.morgannorthdesign.com/uploads/1/3/2/7/132740228/tuvelufe.pdfIn PDF document text
    • http://files.gettemeiers.com/uploads/1/3/0/7/130738739/2592843.pdfIn PDF document text
    • http://fukuwa.lionessprayer.com/uploads/1/3/2/3/132302794/ligulobujikozujer.pdfIn PDF document text
    • http://files.roros.shop/uploads/1/3/2/3/132302816/bopuvole_pajaza_tozurivologo_gubizupujamubod.pdfIn PDF document text
    • http://files.seattlewushu.org/uploads/1/3/1/6/131606815/susiwinupotit.pdfIn PDF document text
    • http://bukiko.avocadotoastfinance.com/uploads/1/3/2/3/132303219/553045fd50.pdfIn PDF document text
    • http://files.allynodonnellrealestate.com/uploads/1/3/1/8/131857305/743ea70aaa133.pdfIn PDF document text
    • http://files.maggielynnelawrence.com/uploads/1/3/1/8/131871984/038f3.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/1/0482/9033/2834/files/libro_tus_zonas_erroneas_opiniones.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5187/6509/files/maxibizubisofejukobamagoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6121/4877/files/east_gaston_high_school_supply_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a89ee90-9483-4557-8676-c55f830793ed/putatidumomawonijafasox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c443497-fffa-4050-8ad9-54ec3fe9bfda/48439019332.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/833f6fa0-212f-4b9e-88f3-68ace209285a/52075832949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b499f9-c9e7-479e-a9cb-fde1d578da4b/pebukukapokabodaripewim.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_off00005493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5493 4972 bytes
SHA-256: bd3aae33a835500f4a793745d8172b90e924a74a753929a87b4cfb52aa03c2f9
font_01_sfnt_off0000658f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658F 12980 bytes
SHA-256: aee313ccb105ee7ee0e3d3293867eeba815267513eaa7e7f2948c4278ba99697

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