Malicious PDF — malware analysis report

Static analysis result for SHA-256 31ba414da7915e2e…

MALICIOUS

PDF

36.1 KB Created: 2020-08-27 18:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 515f9fad4f66ce9d648420e9708965a4 SHA-1: 5a90154fc501b0e9b08ccb5fb8d8fbf734f4856c SHA-256: 31ba414da7915e2ee6760e0fd247d8fd39600feb8b1afaf511624eec773a65dc
194 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link pointing to a URL that appears to be a lure for downloading a zip file, disguised as a case study. The document also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on Shopify. The primary malicious URL is https://ttraff.com/pify?keyword=daniel+caesar+case+study+01+download+zip, which likely serves as the initial stage for delivering a payload.

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=daniel+caesar+case+study+01+download+zip In PDF document text
    • http://files.luvtheview.com/uploads/1/3/1/4/131406861/rugobena.pdfIn PDF document text
    • http://files.proficiencyfirst.com/uploads/1/3/1/3/131383544/047093.pdfIn PDF document text
    • http://zagenumez.lisaruth.net/uploads/1/3/1/0/131070588/eabc5cf75dc56.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/1/0434/1547/0245/files/50041368333.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7751/0055/files/yasuo_guide_mobafire.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0360/8216/files/fun_activities_for_esl_students.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4034/8059/files/sigofito.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5863/4658/files/8673753462.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8354/6267/files/44060616025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/wabot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/general_correspondence_letter_template.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74251218784.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/49613453600.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/zelelefut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/accidents_reported_today_el_paso.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_off00004d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D4D 5504 bytes
SHA-256: 92697c7e5097fab4994368b403af65552e0d61bca395f89455782b7470de7452
font_01_sfnt_off00006036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6036 10364 bytes
SHA-256: 2c3a0f8c8ea3e6844542d7f45b28ff70f46a3b6913a48444f21220d8c787af92

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