Malicious PDF — malware analysis report

Static analysis result for SHA-256 afed189ff2b9a15c…

MALICIOUS

PDF

37.5 KB Created: 2020-09-30 19:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eac51827f477f473626ba87d49e81675 SHA-1: e73384197175b3644081d3ff7b34b35e09874e94 SHA-256: afed189ff2b9a15c55ccb5475953dcec8d99871c3b7d888d83895881d19d9e2d
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with a link farm or phishing lure, aiming to redirect users to potentially harmful sites.

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=calendar+2018+april+pdf In PDF document text
    • http://beteju.cotyandmadison.com/uploads/1/3/1/6/131636698/3060965.pdfIn PDF document text
    • http://files.cuauhtemocmurphy.com/uploads/1/3/2/8/132815367/9f7c14b.pdfIn PDF document text
    • http://mirumopid.widebayrespite.com/uploads/1/3/1/3/131398285/xisilaz.pdfIn PDF document text
    • http://tutosus.newenglandgirlsnpl.com/uploads/1/3/1/4/131407406/8a159f91.pdfIn PDF document text
    • http://files.kingcandy.net/uploads/1/3/0/7/130775462/8002657.pdfIn PDF document text
    • http://files.italybooktours.com/uploads/1/3/1/0/131071137/milofukidexozuti.pdfIn PDF document text
    • http://files.seriesoflight.com/uploads/1/3/1/6/131636813/gezotinesoxef.pdfIn PDF document text
    • http://jimivud.yew360.com/uploads/1/3/1/8/131856190/f01eda1cb.pdfIn PDF document text
    • https://site-1036980.mozfiles.com/files/1036980/gebejos.pdfIn PDF document text
    • https://site-1037184.mozfiles.com/files/1037184/58733414022.pdfIn PDF document text
    • https://site-1036733.mozfiles.com/files/1036733/xutoforerazafifizamolete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0448/2344/5666/files/bus_ticket_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1718/3130/files/xuferuwunexutexekap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5377/7047/files/31334278199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3542/9544/files/personal_finance_literacy_test_answers.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_off00005479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5479 5280 bytes
SHA-256: b8abd18171508838f31f69f892a84c0e1f90f680a96aa5f9faaacde37fef90ba
font_01_sfnt_off0000667b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x667B 10336 bytes
SHA-256: 2a0b9feff065e66fc408724ce5019b2440f5a637f7e55405e22c5ae7c8b61604

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