Malicious PDF — malware analysis report

Static analysis result for SHA-256 6427b09cb42e57ac…

MALICIOUS

PDF

37.2 KB Created: 2020-08-20 03:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d638a60815cb0eecba3570eb15f4289d SHA-1: 45e28a6a86c0f3c66ce1c9f877fee084aa7f0ba7 SHA-256: 6427b09cb42e57ac64ad365be8f8415f3b682ee8674bde577261c125f7c71946
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a redirector service (ttraff.ru) that is flagged as malicious. This suggests a phishing or scam attempt, likely using a 'free download' lure to direct users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=arduino+library+for+matlab In PDF document text
    • http://files.allamericanhousesitters.com/uploads/1/3/1/8/131871786/6762086.pdfIn PDF document text
    • http://files.fuelbarhealth.com/uploads/1/3/1/0/131071056/8851286.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/1/0429/9508/9559/files/check_if_child_exists_firebase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/sql_report_builder_concatenate_fields.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/25655398717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/bsc_online_form_2018_date.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/6505/9997/files/economia_ambiental_en_colombia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5465/2822/files/triptico_sobre_alimentacion_saludable.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7777/1164/files/tijozafogibolodupus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8909/3018/files/selomikaguv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7416/4638/files/nipuz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5539 5108 bytes
SHA-256: 9201f59aefa5d3c2e10338f95991de19c6ce5e80dbae49e83f18d4c248eb7063
font_01_sfnt_off00006684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 9976 bytes
SHA-256: bb48629dff62ff43cc4a25ddebce21e3a8b30c2aec57ae0a1ba888c4666cf99a