Malicious PDF — malware analysis report

Static analysis result for SHA-256 3921142b588cd700…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 14:40:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2771948f7ca2afdfbe79c2f044f8fd4c SHA-1: 82a1c378ef688c90653d2194c4093368ab56a221 SHA-256: 3921142b588cd700e384208e99851dd670dc5921dd4bf8edec7805ee78aabf32
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, identified as a link farm. The primary malicious URL, https://ttraff.ru/pify?keyword=liver+cirrhosis+pathophysiology+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other benign-looking PDF links hosted on Shopify, suggesting a tactic to distribute malicious content or manipulate search engine results.

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=liver+cirrhosis+pathophysiology+pdf In PDF document text
    • http://files.essentialquench.com/uploads/1/3/0/8/130874102/9503363.pdfIn PDF document text
    • http://files.creativestudio23.com/uploads/1/3/0/7/130738850/jonurisaf-tekodex.pdfIn PDF document text
    • http://files.paintingsbymarionlindsay.com/uploads/1/3/1/8/131857193/vemozapub.pdfIn PDF document text
    • http://files.whitmorestemclub.org/uploads/1/3/1/1/131164202/6d79aeb0b4a9db.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/1/0429/8942/0695/files/97496225140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8364/5599/files/tipigakezejef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/rudy_enb_skyrim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1526/6723/files/bams_1st_year_syllabus_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0109/3030/files/typing_practice_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4028/4577/files/62602507473.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/star_wars_galaxies_trainers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2553/8970/files/45320085862.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/cuales_son_los_antibioticos_betalactamicos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/60393324951.pdfIn PDF document text
    • https://medlineplus.gov/cirrhosis.htmlIn 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 5

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_off0000682c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682C 5520 bytes
SHA-256: fb5beee22855199b1ebe371c08bd18d57fd49c88a097dbe3883cae6f813ed6de
font_01_sfnt_off00007af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF7 10032 bytes
SHA-256: 9af6103469eaf1d756111c8343b711844f4458703638cb1a89a5803671d83054

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