Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b266e52fad609a…

MALICIOUS

PDF

62.6 KB Created: 2020-08-15 01:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5f1382bc9a3df0818235ecf21889ed9b SHA-1: ae910ec63e8546b1d714b2f35faaffd963de629b SHA-256: 39b266e52fad609a25b7516b76282e5b8f1e8187d5f40e7cd7f2d6750d1a5426
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for redirecting users to malicious sites. One critical heuristic identified a link to a known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=calculus+early+transcendentals+8th+edition+answer', suggesting a lure related to academic content. The presence of a link farm further supports the malicious intent of driving traffic to potentially harmful destinations.

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=calculus+early+transcendentals+8th+edition+answer In PDF document text
    • http://files.paigeandbrittboutique.com/uploads/1/3/1/8/131871951/nixowudejodebax.pdfIn PDF document text
    • http://files.silverrivercoaching.com/uploads/1/3/0/7/130740524/3993073.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/1/0433/4092/3048/files/cranial_nerves_and_their_functions_table.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/newunarefosexenuxebebivar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/jp_morgan_efficiente_5_index_fact_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/common_questions_and_answers_in_job_interview.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8188/3030/files/80166590456.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6081/2190/files/pitibulabetezab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6450/9094/files/checking_escape_from_tarkov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2287/5813/files/45733250538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9305/6933/files/cub_cadet_owners_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/zobiliboduropofewupululi.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 5

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_off0000af8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF8E 5320 bytes
SHA-256: 0063625fc31df925a873aec1086936cf38c7dc03bbec3d17904eda7e927921c9
font_01_sfnt_off0000c1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AB 13884 bytes
SHA-256: 54d33e3512cc33be75b5feed77ac3361e3f71e81b239d4fd80b77cadbd55dd1b

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