Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6184e490fd902d3…

MALICIOUS

PDF

41.1 KB Created: 2020-10-31 13:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 9fd22e4d212f37ec0fc1f3ea8f0d4b01 SHA-1: 97e84ffad2d07f6ad2f8d5e52e8a048ea91e30d6 SHA-256: d6184e490fd902d376772c646b9ddc2612cf4251af173cd9fdca1e32a695a8f1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links to external websites, many of which are hosted on disposable domains or known redirector infrastructure. The primary malicious link identified is https://gettraff.ru/123?keyword=2020+science+olympiad+rules+division+c, which is flagged as a malicious redirector. This suggests the document is part of a link farm or SEO manipulation scheme designed to drive traffic to malicious 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://gettraff.ru/123?keyword=2020+science+olympiad+rules+division+c In PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/2562645.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/7719612.pdfIn PDF document text
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/9649549.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/tunik_kagetaziror.pdfIn PDF document text
    • https://vemifibu.weebly.com/uploads/1/3/4/3/134354414/96b5abe10bf92.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/5220914.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/8f154832-b6fe-4ce6-b7f3-8bd25fe044dd/damedebigawim.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/laxemoziwavujugi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be3cf20-4e46-42b3-9b8c-84e410da8682/slope_game_online.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/wodub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c97014-765f-4acc-b2fe-98d324a661d1/kobaxedumifidub.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/10876628390.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_off0000613f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613F 5560 bytes
SHA-256: 02a679955c7bee5baee564b981e58f777fd224d3b1ec23dc67a91e22cbbe95da
font_01_sfnt_off00007418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7418 10556 bytes
SHA-256: 14674840c21ad70a8e3c39c6fca237280cfc048741e98f862ef16a25b3f61b15