Malicious PDF — malware analysis report

Static analysis result for SHA-256 1945b8e59dafe50f…

MALICIOUS

PDF

44.0 KB Created: 2020-10-11 04:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b9a59da15ccee5bc6de53852d0711037 SHA-1: fb8ecee4b512fcd6773e63f765e8c6c4008d5eb0 SHA-256: 1945b8e59dafe50fc44229647fa6d08ceb34eeb1c7973eca38ea7a1b4f76fb6c
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to disposable hosting, designed to redirect users to malicious sites. One of the primary links, 'https://cctraff.ru/strik?keyword=malerier+af+John+Green', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this document is part of a phishing or malware distribution campaign.

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=malerier+af+John+Green In PDF document text
    • http://fefijel.alliance11.com/uploads/1/3/0/7/130739590/6380491.pdfIn PDF document text
    • http://files.asifa-awg.com/uploads/1/3/2/8/132814194/d0fc600292e.pdfIn PDF document text
    • http://files.structuralbodyworkhawaii.com/uploads/1/3/1/4/131406049/gazerag-lekazavewekafe-segopofopabone.pdfIn PDF document text
    • http://files.gdilawnservices.com/uploads/1/3/0/7/130738765/5839815.pdfIn PDF document text
    • http://sigiponan.agentcprojects.com/uploads/1/3/1/4/131437181/momoguteriragezinuxa.pdfIn PDF document text
    • http://fojoduv.americangourdsociety.org/uploads/1/3/1/4/131407535/86883b1f0502ed.pdfIn PDF document text
    • http://files.threepillarscafe.co.nz/uploads/1/3/1/4/131483557/lutedorubomu_rutira_pisexibel.pdfIn PDF document text
    • http://files.join-the-dots.net/uploads/1/3/2/6/132681970/petenifumesexu.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/ba24086e-263c-4ebd-92b2-37aeccb61ff7/rubowuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31db7a8e-487e-4204-989b-e5b92771d858/vuzokogofokikut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea23639-ed5c-492d-886b-6c8051c0239f/jalujuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25fbcee-d343-49a7-ba56-883faf5d4dcc/17467427823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2beefb30-8402-48df-841b-7f6e2249b339/24143977123.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7628/7648/files/drums_girls_and_dangerous_pie_movie.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8344/0036/files/oraciones_primer_condicional_interrogativas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6354/1913/files/city_that_never_sleeps_song.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/6328/7448/files/gedexuxajixowevirazi.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_off00006d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D35 4892 bytes
SHA-256: 63492749391905cb48cae79d45fafa257e0056bc54801fd08ab0faf7548485a2
font_01_sfnt_off00007de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DE7 10320 bytes
SHA-256: 89bde08cdf4e992553c85cb49be91f01733f6c0899d3e9de52f6ba5461927e0b

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