Malicious PDF — malware analysis report

Static analysis result for SHA-256 833291520a3b967b…

MALICIOUS

PDF

39.4 KB Created: 2020-08-19 13:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 78c9a47021f0b0e28c9b517bae53735b SHA-1: 67a9a8e84386912e8e8cd0a7adfc4b9474b7e45f SHA-256: 833291520a3b967b116b840b5bf2dc1c8e8f122a50152a5ddd476d6234171825
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one to a known malicious redirector at https://ttraff.cc/pify?keyword=maths+worksheets+year+1+nsw. The document body and heuristics indicate a lure using educational material to trick users into clicking these links. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content.

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.cc/pify?keyword=maths+worksheets+year+1+nsw In PDF document text
    • http://files.dpnutritionandfitness.com/uploads/1/3/1/3/131379980/wojoboda.pdfIn PDF document text
    • http://files.aliawalston.com/uploads/1/3/1/6/131606815/levupuxupoj.pdfIn PDF document text
    • http://files.timberlinelearningcenter.com/uploads/1/3/1/6/131637177/gimefejaxulaxafasuxe.pdfIn PDF document text
    • http://mikotona.ecopdx.com/uploads/1/3/2/6/132681352/xobemexer.pdfIn PDF document text
    • http://vubudinij.openhandstrust.com/uploads/1/3/0/8/130873947/pusimewuje_soligive_luwalabote.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/1/0438/0036/3169/files/centroid_formula_for_different_shapes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7763/1126/files/75025951551.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6559/6321/files/74573963687.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/33224359555.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2541/5843/files/isc_class_11_biology_syllabus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/58889918103.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1541/3658/files/lerefanin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9128/7463/files/here_i_am_lord_hymn_sheet_music.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4504/4892/files/kitchen_aid_dishwasher_repair_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6501/4432/files/zombie_catchers_mod_apk_new_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4319/0944/files/problem_solving_equations_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8049/9879/files/grade_10___12_mathematics_textbook_zambia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/dubem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/59835890153.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_off00005db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DB9 5056 bytes
SHA-256: b32f6e143c79daecf2ef204151f990d684a80d6e3aa5d6954a3be1abc40c38b1
font_01_sfnt_off00006f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F06 9848 bytes
SHA-256: f0e045e89dcb5f9ead01837cf41c058802836e4a38fa0baebc0c4dedda394c7c