Malicious PDF — malware analysis report

Static analysis result for SHA-256 194578ac6164b1c5…

MALICIOUS

PDF

52.6 KB Created: 2020-08-17 00:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 61b59c4735a9d52d58810f9483f91ee9 SHA-1: 4d868674167b36ae35be5ef028b64df781037e69 SHA-256: 194578ac6164b1c5f1bb1899b0ac06dc68f3fee332680962d7e0820a4f54b290
194 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, disguised as a biology worksheet. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to exploit users through social engineering. No scripts were extracted, but the presence of redirector links is a primary indicator of malicious intent.

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://ttraff.cc/pify?keyword=macromolecules+worksheet+high+school+biology In PDF document text
    • http://fipoxise.securefire.co.uk/uploads/1/3/1/4/131438379/worezepasebu.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/1/0429/9679/3503/files/793918870.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6127/8870/files/12135193431.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/dufarusaledun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3459/0878/files/siparegulagotopit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2904/4119/files/libro_el_aprendiz_de_brujo_1_gratis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6582/6719/files/all_company_logos_with_names.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/1272/2585/files/wibegulijisilira.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5664/4774/files/rugemewubukojepozado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3640/0037/files/87285904791.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/bomeba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9460/5975/files/disuzabezenenusuxelepukej.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_off00008d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D09 5616 bytes
SHA-256: 3d477e286e7728acf62a3aa507436de7376345ee4162a7c256a9523fc25b71f3
font_01_sfnt_off0000a025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA025 10928 bytes
SHA-256: 46f1a04801d2eba7a5ad1e59453eaae4c64d71eaf7ca7e657732b16624933bfd

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