Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c37aa7572ee7ba1…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 08:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 20ae810d370bcdfa9e27db7750b130f3 SHA-1: 4c66d9642b793bcc6a8a6b91963328dd8d25e33a SHA-256: 3c37aa7572ee7ba107f73b86283f7c99985b4c0fa923f51025712e8ec143b1df
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.ru/pify?keyword=estrategia+empresarial+libro+pdf as malicious. The document body, though heavily obfuscated, also contains this URL, reinforcing the malicious intent. The ML classifier strongly supports the malicious verdict.

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=estrategia+empresarial+libro+pdf In PDF document text
    • http://files.solomonbrookfarm.ca/uploads/1/3/1/3/131379540/8ae2ab0.pdfIn PDF document text
    • http://files.clubomegatree.com/uploads/1/3/1/6/131607053/rubovefatabe.pdfIn PDF document text
    • http://files.zareenrestaurant.com/uploads/1/3/1/3/131379320/5cc72a0c57fe1.pdfIn PDF document text
    • http://files.llamasintheclassroom.com/uploads/1/3/2/3/132302966/guwimo.pdfIn PDF document text
    • http://files.charlielevine.org/uploads/1/3/1/1/131164054/151530.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/1/0427/9985/7823/files/rearrange_pages_smallpdf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0160/1444/files/towokegomokefojolodulitot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9814/4932/files/21685064635.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2020/5726/files/60606730386.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6219/0499/files/danebuxojeton.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9437/6605/files/13407910661.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8678/2369/files/fonowogavefiko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/33143357387.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6225/5013/files/tibesibokemeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3144/5156/files/midetorisameruzuvak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6961/1935/files/44500435283.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3128/8215/files/all_aarti_sangrah.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62B8 5460 bytes
SHA-256: 6fd5d21017dd43b89a7d28cfaa4489ee3ccf28cc88154edb2cb1157c43565eb1
font_01_sfnt_off00007530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7530 11340 bytes
SHA-256: fa92d5d86e0ed49705856641fee8c229b03c4168570493531027e909d925b3e8

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