Malicious PDF — malware analysis report

Static analysis result for SHA-256 e166c22fefca9bc1…

MALICIOUS

PDF

35.8 KB Created: 2020-08-19 07:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c26c5abd27067b0e7bd4996c58d25efa SHA-1: d1180083b56a90c6b6f2133fd51aabc984e81886 SHA-256: e166c22fefca9bc10d31581072da339887b5748a65fabc41950dd2e62ea114e0
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a tactic to manipulate search engine results or distribute malicious content. The ML classifier also flagged this PDF with high confidence. The primary malicious IOC is the redirector URL.

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=pnaa+asma+2016+pdf In PDF document text
    • http://tagetuk.paulabarbercoaching.com/uploads/1/3/0/8/130874284/dikonirimo_favesu_resovepupavon.pdfIn PDF document text
    • http://files.gonecruisincarclub.com/uploads/1/3/2/6/132682093/4ad09ed6cbe77.pdfIn PDF document text
    • http://files.melrockworld.com/uploads/1/3/1/4/131406934/31cf418.pdfIn PDF document text
    • http://files.jjfdirect.com/uploads/1/3/1/1/131164112/98a1cbed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1703/4134/files/bigajabigewenujagopo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/44834660673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1949/3785/files/jatepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5969/2191/files/john_deere_180_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8155/4325/files/ama_citation_generator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/9883/2037/files/21940473505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/bowebobunozexoda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9501/4042/files/nozegixaduderegapiwi.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 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4224 4972 bytes
SHA-256: fca0c90cf77f9dd3b6e460048084d840ac8ed08360c42845382ca42665334a34
font_01_sfnt_off000052d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52D7 9960 bytes
SHA-256: 0e2bfd35cd667a9a2ac23f42b92f5fae47c4bf43e3d9eec8432d8297e729fbb3
font_02_sfnt_off000074e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74E3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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