Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f513d73b136103d…

MALICIOUS

PDF

42.5 KB Created: 2020-08-19 08:05:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d36f394eeebf5be98e6f6469e517370f SHA-1: 24b5b5c924ea4eb61fcebabf037636fcb48fde4e SHA-256: 3f513d73b136103d7878315f8952e37a018344fd7dfb33cc91a62ffc0153fc50
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, a common tactic for SEO spam or phishing. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to obscure the final destination. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=formal+definition+of+mass+number', suggesting a lure related to academic or technical content to entice clicks. The ML classifier strongly supports the malicious nature of this PDF.

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=formal+definition+of+mass+number In PDF document text
    • http://files.emilycaffery.com/uploads/1/3/1/4/131437513/gutofapodofigonuta.pdfIn PDF document text
    • http://nizol.rollingrhodes.net/uploads/1/3/1/3/131383652/junufa-fedoled.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/1/0435/9585/8088/files/levemilo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/tofuwukinudedataleboguseb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6778/2821/files/natural_causes_of_pollution.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/63726403692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/11406199228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9675/0746/files/calculus_3_final_exam_with_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/complicaciones_del_trasplante_de_medula_osea.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/donevetoperofeselon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1747/7019/files/xijipopijituwigidovijufu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/0201/4357/files/xilokatiketobanivepagut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pobilimej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/12747370825.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_off00006609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6609 5148 bytes
SHA-256: 2d7d66435bcd20139e637ab0a006907b45e8a811bf7cd4b2a6bbea69f8c0b9e0
font_01_sfnt_off0000776a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x776A 11140 bytes
SHA-256: c341da17f1585d4c671cebd10867103e116dbfb36d95b248d44389b388cccf67

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