Malicious PDF — malware analysis report

Static analysis result for SHA-256 b477bb85e98dafa4…

MALICIOUS

PDF

46.4 KB Created: 2020-08-09 18:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: fb5d9dcbf6a707f59adf9fad5664991c SHA-1: 84fe901f6b62859a7998bb0e33b849d8b00f09f4 SHA-256: b477bb85e98dafa4a634555fe1024167a10f92fefc73ab316e8b9c6825acd97c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a 'Certificado medico oficial pdf argentina'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the lure. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to drive traffic to malicious sites.

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=certificado+medico+oficial+pdf+argentina In PDF document text
    • http://files.nightsongpettingzoo.com/uploads/1/3/2/6/132681916/ninikidowemitufor.pdfIn PDF document text
    • http://files.cancercantkilllove.com/uploads/1/3/0/8/130814208/7896015.pdfIn PDF document text
    • http://files.alldogstoronto.com/uploads/1/3/0/8/130874394/tefow_vopuwipeb_degufuxedopu_fukebividek.pdfIn PDF document text
    • http://files.ehsfluidpower.com/uploads/1/3/1/6/131607054/meloleno.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/1/0428/2132/0870/files/71359898339.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1553/6793/files/76725701541.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0446/7677/6089/files/wabifininirojudesuw.pdfIn PDF document text
    • http://files.lkong.people.ua.edu/uploads/1/3/1/6/131636819/c2e358ec.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7505/1413/files/74009710076.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6050/2421/files/regafapavafagalu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/201823564.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9986/5756/files/john_owen_the_doctrine_of_justification_by_faith.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1036/5339/files/mosofopotidemesakudunapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/5292/8919/files/hexadecimal_to_decimal_transparent.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/63032467643.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_off000076a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76A0 5204 bytes
SHA-256: 144d7656350f6061bbfc04d61ae306a837510d89dc4078c83b9a69685881772c
font_01_sfnt_off0000883d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883D 11188 bytes
SHA-256: 0cf275670580c495f58e06adc38501a3b03af243c4a5e88a6c49915c764569c5

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