Malicious PDF — malware analysis report

Static analysis result for SHA-256 420d40dce19cd597…

MALICIOUS

PDF

38.4 KB Created: 2020-10-07 21:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 56d2122c72155e68516586d76de2c28a SHA-1: 8d853eb33b338fc4ba71ccd48d85a19cb019e0d4 SHA-256: 420d40dce19cd59759145b9f90dbb1b9dea1a3191d08c9e81a586ca5a4289b3e
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable domains and a known malicious redirector. The primary malicious URL identified is https://ttraff.club/pify?keyword=mo+a+keet+shrine+chest, which is likely used to funnel victims to further malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of these link farms.

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://ttraff.club/pify?keyword=mo+a+keet+shrine+chest In PDF document text
    • http://files.redeemerlutheranatwood.org/uploads/1/3/2/7/132740978/25bc4334a978.pdfIn PDF document text
    • http://files.groundstonefarm.com/uploads/1/3/1/3/131378988/wufavakuj.pdfIn PDF document text
    • http://files.hcbmusic.com/uploads/1/3/0/7/130775998/04a221.pdfIn PDF document text
    • http://redeni.pleinairaustin.org/uploads/1/3/0/7/130776702/varebuvejakuj_tirobu_wumobuful.pdfIn PDF document text
    • http://files.halfpricefurnitureandmattress.com/uploads/1/3/1/4/131437491/ledeju_rukomivalum_wavebiwibov_wubajez.pdfIn PDF document text
    • http://files.ivarvicenzoni.com/uploads/1/3/0/8/130873944/zogiw-volanep-dubunetov.pdfIn PDF document text
    • http://fatumavus.shazzad.net/uploads/1/3/1/4/131437987/dukexofa.pdfIn PDF document text
    • http://files.cohorun.com/uploads/1/3/1/4/131438682/7893255.pdfIn PDF document text
    • http://pagedekes.20thgmb.com/uploads/1/3/0/7/130738721/9740906.pdfIn PDF document text
    • http://rizuj.yogameditationdangers.com/uploads/1/3/0/8/130813979/pomepu.pdfIn PDF document text
    • http://kakim.trivatch.com/uploads/1/3/1/4/131452841/riseneduj.pdfIn PDF document text
    • http://memak.atlantaalphaomicronpi.com/uploads/1/3/0/9/130969723/5846177.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/84fa92da-13f0-4684-8562-aba04cc7072a/xapelet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/974207c9-f6a5-425f-9b65-e83944511d8f/9062725468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb40bb5d-f77a-49ef-b388-cdf40eabc21d/sadasefuz.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_off000059f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59F5 4924 bytes
SHA-256: c87ee9294c94053ed7b0d8620fa7fe5b6250f1a73f2d270282e8cd19888f64cc
font_01_sfnt_off00006abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABC 9996 bytes
SHA-256: b73316912f8b30c81153f2eabda5392b13d3e4af90be32ceddbccf4d678eaf5e

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