Malicious PDF — malware analysis report

Static analysis result for SHA-256 79aa22f62385e0e7…

MALICIOUS

PDF

38.4 KB Created: 2020-11-04 08:44:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: da5c10d3db86082b5b32edb1fcab13ca SHA-1: c3b10f4683f75ddbd57b5f1d9a16b4a6afe80893 SHA-256: 79aa22f62385e0e710e1827f292ec27be4285f919663eddf18fcae0b6427b10a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link disguised as a vacuum cleaner manual, which redirects to a known malicious URL. The PDF also hosts a large number of external links, suggesting it is part of a link farm designed to manipulate search engine results. The ML classifier strongly indicated maliciousness.

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/strik?keyword=bissell+cleanview+rewind+pet+vacuum+manual In PDF document text
    • https://gabumisuxenumu.weebly.com/uploads/1/3/4/3/134366459/monumunusivew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366024/normal_5f9d357c2c90d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f996ff83c08b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dobesogum/75202029117.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/botw_deya_village_ruins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/240319d6-2e4e-4077-87a9-1d95ad678247/meeting_the_universe_halfway.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e84602a0-2c76-45a6-a045-21fb792365c3/demufu.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/campus_tour_guide_duties.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/john_shelby_spong_books.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_off00005755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5755 5420 bytes
SHA-256: b2c6453cbccfd1f10aff93f0da5c66c619ec89bd730360c3df7fb41ef125b79b
font_01_sfnt_off000069c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69C8 10328 bytes
SHA-256: 80e559aa4b8d6d5f27486a7d0e4c6e5fde15fe033cf40ccd0caf7d1059b8a205

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