Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76619f9dbecc1fd…

MALICIOUS

PDF

46.6 KB Created: 2020-11-04 14:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b460c5ea2034fb9374651578611454ce SHA-1: 1df1b3065ebee451e42e843df2a1617d5570564c SHA-256: f76619f9dbecc1fd24397279fd55c06a8dd281d48209d0d58834f64c1c778568
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs, suggesting a deliberate attempt to drive traffic to malicious sites.

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://ggtraff.ru/aws?keyword=citizen+aqualand+promaster+dive+watch+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f9cb0eaeb896.pdfIn PDF document text
    • https://zizukomeluze.weebly.com/uploads/1/3/4/5/134582384/rudonaregikifa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f920ad6e259b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5f9a800075f42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f872da77eb8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_5fa01fc442698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366043/normal_5f86f4fd927d8.pdfIn PDF document text
    • https://noxurujoba.weebly.com/uploads/1/3/4/3/134384046/270098444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365546/normal_5f942f9283c4b.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/lijulijowivaze/carnatic_music_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0eea231-fc18-41cb-b198-5a2b9baac94f/marilyn_manson_nobodies_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff6984d4-dec2-4189-b9ee-98d42c4b4f87/zalogenimisijeximutafeluk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 2856 bytes
SHA-256: 64374132afc67ad158ab3658b1ae447cd0f0452c72726b329d1d4d858c693bf2
font_01_sfnt_off00006d6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D6F 5548 bytes
SHA-256: 8aa56296af395689380e5d40ef3d4d5c41699e2a9237c5f9bae8d645417eee7f
font_02_sfnt_off00008036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8036 13880 bytes
SHA-256: c7c7759751f551d1a818e927035f8d4c77e3ebfe97cc62c9c869fe772334b695

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