Malicious PDF — malware analysis report

Static analysis result for SHA-256 246cc98096d93bf0…

MALICIOUS

PDF

46.3 KB Created: 2020-10-31 09:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fd2353c061993e821efe5675f7d9fddc SHA-1: 9253ada22773ee371ebdc919348e7f829a1e803f SHA-256: 246cc98096d93bf05c184f94e698bf50cdd7b69cb414b258e7b7604e42ae5c0c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, indicating it functions as a link farm. One prominent URL, 'https://ggtraff.ru/strik?keyword=how+old+is+bobby+debarge+jr', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to potentially harmful external content.

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://ggtraff.ru/strik?keyword=how+old+is+bobby+debarge+jr In PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/4054812.pdfIn PDF document text
    • https://miburinu.weebly.com/uploads/1/3/4/4/134464577/xisikoduxizul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_5f97026e25e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388067/normal_5f8f760400086.pdfIn PDF document text
    • https://kigibituridugu.weebly.com/uploads/1/3/4/3/134352406/e17b7fb430.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/datox.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/9279448.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393624/normal_5f915f3272e7a.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/8530117.pdfIn PDF document text
    • https://vefavufarexuba.weebly.com/uploads/1/3/4/3/134315694/viweremise_nurulax_dejumoli_voturuguwuji.pdfIn PDF document text
    • https://pasuliwipo.weebly.com/uploads/1/3/1/4/131452824/tegafevutu-narusoka-vejevelid.pdfIn PDF document text
    • https://wojedebaroz.weebly.com/uploads/1/3/1/6/131637691/0e5aa94c67ff88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5f8fe860203e1.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/koloro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000074a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74A0 5364 bytes
SHA-256: ba229fa51fc04adc230f94ff4aa4c687ff75483b6983fd990acd623384739e63
font_01_sfnt_off000086fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86FE 10984 bytes
SHA-256: 2ceff7edc0a8378a17d948ff47dab477830a6da9cc708002c5320d1a4677d3b0

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