Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c37a2382b7b630…

MALICIOUS

PDF

38.2 KB Created: 2020-08-08 15:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5dc5f01d9de5b0e8d80c3dfeeb534a63 SHA-1: 72725aee06c50e5302a10761ed71cd012fb33318 SHA-256: e1c37a2382b7b6302ea636491db2a138649840282b817a5d141914e213384014
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to its structure, which includes a significant number of embedded links to external PDF files. One of these links, 'https://ttraff.ru/pify?keyword=noun+adjective+and+adverb+pdf', points to a known malicious redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content through a large number of seemingly innocuous links.

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=noun+adjective+and+adverb+pdf In PDF document text
    • http://files.strongholdrealtyga.com/uploads/1/3/1/3/131381772/1166121.pdfIn PDF document text
    • http://files.thesugarqueen.net/uploads/1/3/0/9/130969726/zuvuwuvawubizozita.pdfIn PDF document text
    • http://files.visitkaunas.net/uploads/1/3/2/7/132712011/lojojase.pdfIn PDF document text
    • http://files.torahfun.us/uploads/1/3/1/6/131636956/3d4122878.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/1/0434/0239/5798/files/womav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/votodudemiduforufebup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8682/2053/files/.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6580/2903/files/46541057398.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9977/4364/files/bezibixili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rewosegukedisupagur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0402/5242/files/basic_chinese_alphabet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/plot_normal_distribution_in_r.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4993/4229/files/jexupubuzadanusenuzip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7807/4020/files/7187405218.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 6

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_off00005889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5889 5184 bytes
SHA-256: a805ebad7939ecd9668a9f7b5e6935ca6ab1f65363750d442eee44f723db9f9c
font_01_sfnt_off00006a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4C 9900 bytes
SHA-256: c842fe11e810a74b055609c5fe19cbf5ba300d8f64eec02dfa7400e32ba493f8

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