Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bbbf3e738896958…

MALICIOUS

PDF

45.1 KB Created: 2020-10-04 03:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2e60c999381650831a85f59b59b92f7b SHA-1: e5011e92a0759c5ea31368def722b5fbb782f22e SHA-256: 4bbbf3e738896958de3d3cd04aee96349d892cd6595b45e1cb29432689249d0f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to disposable hosting, and at least one URL is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains a URL that is part of a link farm, suggesting an attempt to lure users to malicious infrastructure.

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=luck+be+a+lady+tonight In PDF document text
    • http://files.kathrynrobertson.co.nz/uploads/1/3/1/4/131453651/1049ac4a99a9.pdfIn PDF document text
    • http://sokisapo.broadwingadventures.com/uploads/1/3/0/7/130739635/26237316.pdfIn PDF document text
    • http://files.maryjoyceart.com/uploads/1/3/0/7/130775405/bonutasijuvinex.pdfIn PDF document text
    • https://site-1043215.mozfiles.com/files/1043215/5594289814.pdfIn PDF document text
    • https://site-1036886.mozfiles.com/files/1036886/28476054320.pdfIn PDF document text
    • https://site-1036652.mozfiles.com/files/1036652/semilu.pdfIn PDF document text
    • https://site-1039800.mozfiles.com/files/1039800/601730864.pdfIn PDF document text
    • https://site-1036917.mozfiles.com/files/1036917/diletijuzujowuno.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/4ea5d37d-4aa6-454c-812c-17646e7bfaa8/jifujebaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d6bd9f-55ce-43f8-879b-7884e0553046/vekunoluwosokanivekobil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e37fcac9-2ac6-4b8f-9e40-ccffa879115c/52517349340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ede16335-1497-4d2b-8f5a-2d3dbf4ae067/gebaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e5cf4a9-5344-47a1-9409-cac2eccc4406/85456960817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a965394f-acba-4846-b3bd-a3f695ce78c5/328928651.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2d315d-6265-4fb9-a9e4-8bd1328c8c6e/zobagaluf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35f2e6af-a87b-4aaf-bc19-9fd4ee6041af/vafipiketafulododovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d209f30-ef61-4b6c-8eb5-130a6ec3b23c/40495087209.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_off00005c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C0C 4228 bytes
SHA-256: c7e3448c1e564e1e12e4545ce494becb30441ecd11c414b6ff3443a08c0a7f13
font_01_sfnt_off00006ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE1 5172 bytes
SHA-256: 9bbbd980ba563c62c189bbace23777626c45c340171abc1064685d2bfb3c3046
font_02_sfnt_off00007c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C89 13404 bytes
SHA-256: 524e435ff0c41ab71995d0e7e6b80573ae0f31220e8fed25e6535ffed2222d1f

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