Malicious PDF — malware analysis report

Static analysis result for SHA-256 266b866243de7fbe…

MALICIOUS

PDF

37.6 KB Created: 2020-08-25 07:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5bbaa6a2bb3a950778cd0bae19778f46 SHA-1: 328ab51f9745b5b2c9a9359b2ca96f8422fb5410 SHA-256: 266b866243de7fbee5a4b86ca5de4ffe51af819e5ae38b9370758c8aebbdd6db
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=larson+medical+embryology+pdf'. This indicates the document's primary purpose is to lure users to a malicious site. The presence of a PDF link farm further supports the malicious intent, aiming to distribute malicious content or engage in SEO abuse. No scripts were extracted, but the embedded URLs and heuristics are sufficient to determine the attack pattern.

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=larson+medical+embryology+pdf In PDF document text
    • http://files.planetdk.net/uploads/1/3/1/4/131406592/nitefumuroxiz.pdfIn PDF document text
    • http://kawubu.lizzdunich.com/uploads/1/3/1/3/131383434/fusuruwudizamukuz.pdfIn PDF document text
    • http://wifafireg.a2therapyworks.com/uploads/1/3/1/4/131438464/5c2748708.pdfIn PDF document text
    • http://files.quantumarabians.com/uploads/1/3/1/4/131453215/601b62e415b4bf.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/1/0439/2137/5387/files/kannada_bhavageethe_please.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/81792605891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3943/8486/files/jobigutef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6881/7562/files/46851492541.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0453/6195/4971/files/46167014334.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7656/6684/files/dadoxawagerodogopejajonav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8220/2782/files/80245642240.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3850/6146/files/the_microkinetics_of_heterogeneous_catalysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2315/5878/files/fafopetifujibelavapizuja.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/jipamilolijap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/repovan.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 3

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_off000054b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54B3 5660 bytes
SHA-256: de280e3e899b4bce4bdb455c5642b0549e2343e16247f41fa4932f55e01dc462
font_01_sfnt_off000067d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D9 9876 bytes
SHA-256: b23bac4ba83fb754b9efe324462d565fb839ce45812729366bef192a30e37a46

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