Malicious PDF — malware analysis report

Static analysis result for SHA-256 861708c3ea4357dc…

MALICIOUS

PDF

34.2 KB Created: 2020-08-09 21:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: f873f402c0e66e890e8afb01f20faaee SHA-1: b5c15e00a24bbfd889ef5dd4b3d81bd9aceac52c SHA-256: 861708c3ea4357dcb77e2b3a9e785976d51d15f4f589fd68d611972a614d4b1e
194 Risk Score

Malware Insights

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

The PDF contains numerous links designed to appear as legitimate downloads, but the primary link redirects to a known malicious infrastructure. This technique is often used to distribute malware or phish for credentials. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the use of redirector links and a link farm to obscure the malicious destination.

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=big+data+processing+with+hadoop+pdf In PDF document text
    • http://files.maineanchor.com/uploads/1/3/2/6/132695663/315ddc4.pdfIn PDF document text
    • http://files.knowingourpast.com/uploads/1/3/1/1/131163834/148198.pdfIn PDF document text
    • http://files.beaconsfieldfestivalofchoirs.com/uploads/1/3/1/3/131384127/direroje-gowivotu-zeduti.pdfIn PDF document text
    • http://fixozagov.arttherapycolorado.org/uploads/1/3/1/3/131379730/1815320.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/1/0434/7569/7830/files/90562150126.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3358/4035/files/55005093421.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6644/1376/files/castle_crashers_weapons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5548/7905/files/57461086568.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/biology_notes_12th_class.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5476/8032/files/56936443891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2333/4567/files/9995689686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9900/4827/files/10276132199.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6372/1637/files/dabowime.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1690/4104/files/suloruwuwitajukudurik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4890/9462/files/airman_ga_taosenai.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 2

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_off00004602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4602 5528 bytes
SHA-256: f203658919fe0ca6fd1a24069cbaf69016a75d9dedcf5ec079f68bd01950bd8d
font_01_sfnt_off000058e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58E3 10344 bytes
SHA-256: b2316bb0e5cf5b660ee25971ed969429a81bb0a9764001241e8cab917bbc2e32

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