Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8291d18bb84a8d…

MALICIOUS

PDF

43.7 KB Created: 2020-08-12 16:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2b7c27b95f7f381c0ae4febb20c5ea61 SHA-1: 65181968099eebbbe4be322b444a51ee423ad2a4 SHA-256: fc8291d18bb84a8da242bdff1320d0802ac75d9a4fd43acc35a330237c2b1488
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, including a known malicious redirector. The document body, though partially corrupted, suggests a lure related to 'number theory project topics'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF with high confidence.

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.com/pify?keyword=number+theory+project+topics+pdf In PDF document text
    • http://jujopa.intrinsictheatrecompany.com/uploads/1/3/0/7/130739590/6778859.pdfIn PDF document text
    • http://vipuxike.candlesbybarwick.com/uploads/1/3/0/7/130739732/10978cdf3e.pdfIn PDF document text
    • http://files.vox.vet/uploads/1/3/0/7/130776483/purojawoduwevede.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/1/0439/1793/4747/files/34140113392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/mulasubakoluxitabunudepo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3772/6622/files/linfoma_de_burkitt.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9055/8622/files/dinewurenorezimub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/luvikumefoporedufa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/32729379467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8447/1719/files/89843335294.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5279/2982/files/92255133457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2137/7434/files/storm_in_a_teacup_physics_of_everyday_life.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/4526/8128/files/40876679817.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2692/3172/files/49921668067.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/lexibapilejezis.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_off00006db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB6 5440 bytes
SHA-256: 51cb2b12bcd587575ba22b77ea95b656b9721401113d1b61469ab8cf7da7a5db
font_01_sfnt_off00008026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8026 9964 bytes
SHA-256: 38753fe7f7d3b408c664077c9c5d17c12298a953242757f87f785c968a561cac

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