Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6b3a6f1924e690…

MALICIOUS

PDF

44.5 KB Created: 2020-08-12 15:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 108a02ff6c30c2cc135a81692a34503f SHA-1: 6e06b08051df5aebeeff44b3afa5c5746aee766a SHA-256: ef6b3a6f1924e6906f7141599d9e6dc14efd71591a999528e18af489440368a4
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a large link farm suggests an attempt to manipulate search engine results or distribute malicious content through seemingly benign documents.

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/wb?keyword=kruss%20polarimeter%20manual In PDF document text
    • http://files.coloresalonstudio.com/uploads/1/3/2/3/132302735/d9964486a53.pdfIn PDF document text
    • http://monevap.tsceramics.com/uploads/1/3/1/3/131398244/xajokidodipoxagip.pdfIn PDF document text
    • http://tufojera.rearviewthis.com/uploads/1/3/2/6/132682646/2928708cf3e.pdfIn PDF document text
    • http://files.coaching-planet.com/uploads/1/3/0/8/130874554/8237006.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/1/0428/4334/0956/files/58736898747.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4154/5626/files/alter_ego_b1_cahier_d_activits.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6040/3103/files/tinotewazuvadan.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2827/4585/files/sewedukipexor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/35065135089.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7448/5400/files/vapilejobisurasinax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2398/3001/files/nacionalismo_mexicano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/affordable_housing_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/47892670619.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1523/3959/files/avengers_watch_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0215/0557/files/sutijub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/0665/9493/files/secured_copy_text.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 7

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_off00006f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8C 4936 bytes
SHA-256: 4b33b37ad335e6677d960085b3ab5b8219b2c8cebe090c4761f7fe4afb5520e8
font_01_sfnt_off0000803f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x803F 10780 bytes
SHA-256: c12eef954526077b0ec34c0d9334eb29d60c3f8b5702d85e07d283209b8f9b9d

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