Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc739a756feea63…

MALICIOUS

PDF

41.3 KB Created: 2020-11-04 23:21:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2d84da9eca21a79a712c60ffb05f3211 SHA-1: 94a97fa43c60bd1789f6ce29fb4dbd835d126afe SHA-256: cfc739a756feea6370d9afab427857d848806a5865ae0f74152d410a7d2e39c8
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that aligns with the malicious redirector finding, suggesting the primary purpose is to lure users to a compromised site.

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://gettraff.ru/123?keyword=summer+trees+hoa In PDF document text
    • https://vabejodero.weebly.com/uploads/1/3/4/3/134378136/sidizoguwo.pdfIn PDF document text
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/8079309.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/111b39bb-1559-4595-b475-f6040b08f7dd/78072603386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029c43fe-9600-42c2-b2f3-a57bdfed3df9/43208451796.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/85th_constitutional_amendment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69451bca-acdd-49b4-9f5b-a3a15395e519/lovunuloleferuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50659d02-a222-4ce9-adfb-e74784e69d85/27150676900.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad8c6a3e-94c4-4be5-b6fa-9de42d2393a6/nubovawawowawoteda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11200fa-0afa-4b67-adf1-197c9ba71aa4/dagomisawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f0a7153-983a-45c5-ab06-e1a24ff0a800/xowiritawinitojekilefeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2280228f-48d5-4e40-a964-9a442958836f/sikidagiduwuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdad2caa-6f97-47d2-8945-7eced301b503/febovujafolonewe.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_off000062cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CF 4996 bytes
SHA-256: 97be7ea07c27f7b8dc96e05cba4c8046f2dca0c841a11ba30dd871e5159a1829
font_01_sfnt_off00007396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7396 10812 bytes
SHA-256: 7b0f2ad71804382318a111721593c14876f8a59ce3afc5e493fc49c65ca273bb

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