Malicious PDF — malware analysis report

Static analysis result for SHA-256 b11d52e092084f0b…

MALICIOUS

PDF

44.2 KB Created: 2020-10-26 08:31:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d77544a24841d10ae7f64da95e2b161f SHA-1: 6ca7cd8e787993c8d55c2736952fb50ff8852f6b SHA-256: b11d52e092084f0b23b637951212917f306f09d9ff802169c917c6f8356fe367
194 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, likely to trick the user into downloading a payload. The document body and embedded link text suggest a lure related to robotic arms, and the ML classifier strongly indicates maliciousness. The PDF also contains a link farm, indicating a broader SEO poisoning 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/123?keyword=pick+and+place+robotic+arm+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5f8b0107463d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5f93589fd06fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_5f9015505b77a.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/f6df655a19a0b84.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/ce02014a20d.pdfIn PDF document text
    • https://tiposowa.weebly.com/uploads/1/3/1/1/131164246/5521068.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/bawafe.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/tosevud/gijadupepotipikabotu.pdfIn PDF document text
    • https://s3.amazonaws.com/lefemijip/cations_and_anions_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/882957107.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/zuwobenalaxetir.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/administrative_science_quarterly_journal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b704de9d-21bc-44dd-9dde-a630fcd799ac/voduwujolumazubozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febd0104-ea36-4ff2-8e19-edcd729ba5e7/76373263612.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77aa2675-87ee-4139-b736-a7c482e08339/teoria_general_del_proceso_cipriano_gomez_lara_el_sotano.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/34039239674.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/sisoweki.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/notuxuferojofodapozaf.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/popuzinivezawifulida.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/simamu.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/65372504939.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/31527765865.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/26435326355.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_off00006da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA9 5328 bytes
SHA-256: 3a831b45bd30551f509b32e263135aaa7fa1a53d52dcb351775cc8cf93f4acb6
font_01_sfnt_off00007fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA3 10568 bytes
SHA-256: 6827340c5225391ad4fb5d97fbc5a7fce747350352fa27e832e2a991a383a85a