Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e56a94d0f0e1ed…

MALICIOUS

PDF

33.6 KB Created: 2020-08-07 02:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 55d18a61637e4beec8e59fcdbf367fe3 SHA-1: c670b58c166de99fa1d2a903b86be414089f2eae SHA-256: 43e56a94d0f0e1ed057e043031f24a4fda685b01ca72efcd1103d9ee3882f4db
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=cambridge+primary+science+skills+builder+4+pdf'. Another heuristic flagged the document as a link farm, suggesting an attempt to manipulate search engine results or distribute malicious links. The document body contains text related to 'Cambridge primary science skills builder 4 pdf', likely a lure to disguise the 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.ru/pify?keyword=cambridge+primary+science+skills+builder+4+pdf In PDF document text
    • http://files.riverwoodwinery.com/uploads/1/3/2/6/132695525/vadote-tiwibakoj-fusixowo-nofiwibevos.pdfIn PDF document text
    • http://files.sacredlivingspiritualcenter.com/uploads/1/3/0/7/130739061/xewali.pdfIn PDF document text
    • http://bobexejip.musiccitygoldendoodles.com/uploads/1/3/1/4/131453850/5017552.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/1/0438/5266/0901/files/resowukebunododabapos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9825/0141/files/jebij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/gidolegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/beyond_compare_to_text_not_found.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4175/9138/files/2610678122.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0657/4240/files/wumezolemukesekipu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/norm_cdf_vs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9583/2216/files/anatomie_et_physiologie_du_pied.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5420/3031/files/trinomio_cuadrado_perfecto_ejemplos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/agnieszka_mielczarek_ksika.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4073/5381/files/vavuvuzositifusobim.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 4

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_off000044b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44B5 5772 bytes
SHA-256: f226ce5c99f4113e19b8aa69e9487f74a6ae3ccadb411f7a786a2f8e03a26366
font_01_sfnt_off00005851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5851 9632 bytes
SHA-256: 0bd04b782ec9ed983af44843093b0bd43d166f0d9dcf7508155850225a5c5644

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