Malicious PDF — malware analysis report

Static analysis result for SHA-256 8253e6b5a8a5cb6c…

MALICIOUS

PDF

38.8 KB Created: 2020-10-06 19:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9932dba59e1385045f70918059c39543 SHA-1: 57a5526e4b5f957785716cb80dad2d3cfb28da5c SHA-256: 8253e6b5a8a5cb6c09341cb99a1f5de95599bf00dd62a3e24ad76ba1d1abb750
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable domains and are flagged as a link farm. One URL, https://cctraff.ru/strik?keyword=engineering+computation+with+matlab, is identified as a known malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure suggests a tactic to drive traffic to malicious sites, potentially for phishing or SEO spam.

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=engineering+computation+with+matlab In PDF document text
    • http://files.partnersforgrowthcb.com/uploads/1/3/2/7/132740764/gofabegesitatidugos.pdfIn PDF document text
    • http://metomaped.inpursuitmultisport.com/uploads/1/3/1/4/131437160/1485404.pdfIn PDF document text
    • http://fevazuwat.valleymobileoil.com/uploads/1/3/1/3/131383493/tuzijanure.pdfIn PDF document text
    • http://files.koahspearguns.com/uploads/1/3/0/7/130776433/rubokafodituw_kimowopoxegoniw.pdfIn PDF document text
    • http://peroka.msluxuryhouses.com/uploads/1/3/1/8/131856543/e3a8b47.pdfIn PDF document text
    • https://site-1036938.mozfiles.com/files/1036938/31831035935.pdfIn PDF document text
    • https://site-1037085.mozfiles.com/files/1037085/917273201.pdfIn PDF document text
    • http://repepedi.designerconsignors.com/uploads/1/3/0/7/130739090/wagaluzu.pdfIn PDF document text
    • http://fikile.myeffectivo.com/uploads/1/3/1/6/131607600/3dba4f0baa21a.pdfIn PDF document text
    • http://files.emilymclaughlintravels.com/uploads/1/3/1/8/131856706/d6e33b107a7748.pdfIn PDF document text
    • http://seluzo.genawave.com/uploads/1/3/1/3/131398177/detanu_kavawape_zopenuri.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/1d86df54-7c86-4c10-8d72-23a0d1841eb5/xoxogiwajazula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f16810f-a9ab-426c-ba9e-d9520b7831a1/85001519620.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15125d4a-5b7d-4ec6-b090-e81980104df6/towakuseno.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_off00005851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5851 5360 bytes
SHA-256: f0c5e84bc3716a3481e61ed01456e971d318b810de746b48a35c43359d33a476
font_01_sfnt_off00006a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A78 10728 bytes
SHA-256: f2e8d32dee6bcce9f3519df89c929b63f5ad27a3a9c963ce3744d05732b03458

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