Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cd710bea1be098…

MALICIOUS

PDF

56.3 KB Created: 2020-08-19 00:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d4f755e2ac3dcaff03a3ec6d9141bba6 SHA-1: 3d162abea2af64cb01a04efd8a598f9a4ba58c3a SHA-256: 71cd710bea1be0985b7d204ec4eb305a6644127e540cff7137be38fe6c4a924b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to redirector infrastructure, suggesting a link farm or phishing campaign. The primary redirector URL, 'https://ttraff.com/pify?keyword=classroom+observation+report+conclusion', is designed to obscure the final malicious destination. The ML classifier strongly indicated maliciousness, and the presence of redirector links aligns with common phishing and malware distribution tactics.

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.com/pify?keyword=classroom+observation+report+conclusion In PDF document text
    • http://tatinisam.emmafisk.co.uk/uploads/1/3/1/4/131407921/3552422.pdfIn PDF document text
    • http://files.cornerstoneferndale.org/uploads/1/3/1/1/131164047/kexigiketin-fivutuz-tozufidoju-dipunolizi.pdfIn PDF document text
    • http://files.regentlaw.net/uploads/1/3/1/1/131164386/45252e8b1475.pdfIn PDF document text
    • http://files.wheeler-fabrics.co.uk/uploads/1/3/1/4/131406430/5814563.pdfIn PDF document text
    • http://zuper.diggersite.com/uploads/1/3/1/3/131380600/kazajutusise-dafipabu-nuful-velomufagizana.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/1/0433/9597/3283/files/felezimirajekifo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1687/0309/files/98989339241.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7695/1974/files/86030198540.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/6033/1423/files/bryson_tiller_patient.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/nba_live_2007.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9266/3702/files/kerusonomo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0062/6325/files/rozalotesavivanapen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8979/5998/files/20870393885.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/tebiduwiwomazugu.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 2

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_off00009fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA7 5184 bytes
SHA-256: 05f71a8d075628d50feff7dc0c6c88f4056c6a314da470b365b5dc143ee4e108
font_01_sfnt_off0000b139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB139 10372 bytes
SHA-256: 83f5028cbdff6023ec4345e3a5d361c0a86542da6b6d29665110083a6a0c5e06

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