Malicious PDF — malware analysis report

Static analysis result for SHA-256 47ac5af97e54b08a…

MALICIOUS

PDF

41.8 KB Created: 2020-10-08 06:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 54be9075832b7b80c140139c22630c58 SHA-1: b590ad8aaf67dbdab9bbf97da049e85c98599180 SHA-256: 47ac5af97e54b08aae19c5097d269d0444192873fe242a76799bc4fda4c0ce76
184 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting and redirect to a known malicious URL. The document body itself is heavily obfuscated but contains references to the malicious URL and other links, suggesting it is designed to lure users into clicking through to malicious infrastructure. 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://cctraff.ru/strik?keyword=circumference+of+a+circle+word+problems+worksheet+pdf In PDF document text
    • http://pawar.lewisinteriors.com/uploads/1/3/1/1/131163763/xuxelubanetukuzazu.pdfIn PDF document text
    • http://files.hiddenoakacresnigerians.com/uploads/1/3/1/4/131438137/2e3afc.pdfIn PDF document text
    • http://rixikija.willowwoodhandmade.co.uk/uploads/1/3/1/4/131453278/5704845.pdfIn PDF document text
    • http://dojuga.campweempower.net/uploads/1/3/0/7/130775166/delerikotanemevagef.pdfIn PDF document text
    • http://files.followtheleaderedu.com/uploads/1/3/0/7/130740022/xizulunuwopazudupi.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/vukopigubakapujawa.pdfIn PDF document text
    • https://site-1040142.mozfiles.com/files/1040142/23278288828.pdfIn PDF document text
    • https://site-1037096.mozfiles.com/files/1037096/garofurenazolu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4583/7208/files/70310766854.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0467/5695/4275/files/difference_between_density_and_viscosity_of_blood.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/0405/0084/files/27629843926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f13c2fc9-3786-4098-888d-6912c732e7e4/zuwanobupatudadewuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29e3eb5e-5e3e-4387-90f6-e49c7453a754/73307684392.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_off00006480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6480 5596 bytes
SHA-256: a0ed064b9ac065ee2d0f10dc38005532ced4adfb2f0401a28206848e145759b2
font_01_sfnt_off00007761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7761 10140 bytes
SHA-256: d7ed42cfd9c5589d623bb084c0058eed8bea055ce390a37e57322b157e093a93

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