Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6eb9fa47fc389d…

MALICIOUS

PDF

50.8 KB Created: 2020-11-09 10:27:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: ddce02b036fda10a613bae31fe995ec5 SHA-1: 914c8c5f75420b839d08f042e919119bc0997b1c SHA-256: 4e6eb9fa47fc389d6b28dafab693dbb5acdd566c16f385699fdfa4e57931e711
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the malicious URL and other links, suggesting a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness.

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=dillon+rl550b+price In PDF document text
    • https://rinumobepora.weebly.com/uploads/1/3/4/3/134377952/211eedae6f61a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383451/normal_5fa6a536528a1.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/5339265.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/aefa8.pdfIn PDF document text
    • https://gazubulurogul.weebly.com/uploads/1/3/4/4/134493330/kazaxaja.pdfIn PDF document text
    • https://dokipodaj.weebly.com/uploads/1/3/4/3/134306773/82535309c.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/vunobemopibunos.pdfIn PDF document text
    • https://zejaxosadakawur.weebly.com/uploads/1/3/4/3/134372542/pujubelisapabasusum.pdfIn PDF document text
    • https://nirejabepifu.weebly.com/uploads/1/3/4/2/134266024/4619117.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411493/normal_5f99402d5540e.pdfIn PDF document text
    • https://mogoribomos.weebly.com/uploads/1/3/4/2/134266362/wilubade_jukedo_mozolebizusi_komafajeb.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/jinitorip-bolag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/74419237033.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/cardiopatia_diabetica.pdfIn PDF document text
    • https://wikadiritupu.files.wordpress.com/2020/11/lunuwu.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_off0000865a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x865A 4944 bytes
SHA-256: 6320d43325d2eeef7d3e972ce00392d6642c74f2ca6096f79c3eddfe6e12c35c
font_01_sfnt_off00009740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9740 11492 bytes
SHA-256: b74b03df845ad18432f69e8940aca66bbaae75581e60fc992356c38d3eaff7bb

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