Malicious PDF — malware analysis report

Static analysis result for SHA-256 1443c4f9c1b90f62…

MALICIOUS

PDF

43.2 KB Created: 2020-08-22 12:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 35fa50e284cc5f4233cb96f07e7fcfc4 SHA-1: a00a87ac4d4d9d755c5173c703a9402406e8a119 SHA-256: 1443c4f9c1b90f627151f9763901ba91750d9869a297862f21311b0a2b81acc7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links designed to create a link farm, with a primary redirector pointing to a lure for 'Audacity free full version with crack'. The ML classifier strongly indicates maliciousness, and the redirector URL is flagged as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit users through social engineering and potentially deliver a second-stage payload.

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.
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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://ttraff.ru/pify?keyword=audacity++free+full+version+with+crack In PDF document text
    • http://kolobaga.briana-jenae.com/uploads/1/3/1/3/131379578/xazuviginuvosib-nodoxelagajolad.pdfIn PDF document text
    • http://kogofaxe.dianastarr.ca/uploads/1/3/1/3/131384600/650814.pdfIn PDF document text
    • http://files.worcesterdogs.co.uk/uploads/1/3/2/8/132814791/3600534.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/1/0436/1378/2173/files/zerisavuganiwizilifixe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/23345935007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2041/9226/files/psc_bulletin_december_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/avian_influenza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0456/8616/1567/files/movie_company_intro_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1278/4277/files/stock_market_holidays_2016_usa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/kesateboxorozuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/vegisomerugunuparopuve.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4C 5416 bytes
SHA-256: 159a6799c287f74bd464983568c11f605afd5d30ec891aaacf31ac3f0986cc78
font_01_sfnt_off00007dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC5 9968 bytes
SHA-256: 15f0e36ef75197a0df6500cbe53500e50227a1bcd8e79cf87b9d9654ff122aac

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