Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81eaee2761d3784…

MALICIOUS

PDF

62.7 KB Created: 2020-10-08 21:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 18a4c285eda075074b985fb31d289dbc SHA-1: 9814a2b4a31f35f2959c76f7ac1117212185e87a SHA-256: e81eaee2761d37844a24c483502dc585d29bb403f7bc53c10b5d229992a05460
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The presence of a large link farm on disposable hosting suggests an attempt to manipulate search engine results or direct users to malicious content. The ML classifier also strongly indicated maliciousness.

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://cctraff.ru/strik?keyword=chelsea+cutler+sometimes+sheet+music In PDF document text
    • https://site-1039608.mozfiles.com/files/1039608/63209293839.pdfIn PDF document text
    • https://site-1040975.mozfiles.com/files/1040975/49996390517.pdfIn PDF document text
    • https://site-1040881.mozfiles.com/files/1040881/65032341429.pdfIn PDF document text
    • https://site-1036996.mozfiles.com/files/1036996/pugufomugabulukukelewaki.pdfIn PDF document text
    • http://gevos.mainelymama.com/uploads/1/3/1/4/131453449/640b942aa6a.pdfIn PDF document text
    • http://mivedotu.scenesofvirtue.com/uploads/1/3/2/8/132815806/3824681.pdfIn PDF document text
    • http://files.jilliansapothecary.net/uploads/1/3/0/7/130739023/letojilag.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/2d1a9b11-b29e-44b2-8e5b-7d6dc67585aa/32445217000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e87f5d5-6884-400f-aef5-d40a68e80b61/batuworaberureger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63e617a4-fa41-4ba7-a2bc-16417bc9e897/neforufaxojubumivowe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3846c1e7-2759-43fb-b073-20ed022d7004/kuwibokezomojivifiniwixos.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_off0000b8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E6 4944 bytes
SHA-256: 887e5bcf79923fc952334924946787a7f94203fa0c9f08c629b0932aae50878b
font_01_sfnt_off0000c983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC983 10628 bytes
SHA-256: 0494303541cf806c0345ae35d0e39443c8e8b0b698b596a43a7978c5ef8fe203

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