Malicious PDF — malware analysis report

Static analysis result for SHA-256 329c29161ca5dc73…

MALICIOUS

PDF

46.7 KB Created: 2020-09-30 16:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 997e8812c6aa7267a72744854e419697 SHA-1: 2000d318dcf4fcb6bb3e1d51ab2fb1aa9922cc8f SHA-256: 329c29161ca5dc73905bde2d0e426ec4a3852cf9b95d64a510831dcd2a842782
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://gettraff.ru/strik?keyword=atividades+de+alfabetiza%25C3%25A7%25C3%25A3o+1+ano+para+imprimir+pdf', which is flagged as malicious. This suggests the document is designed to redirect users to malicious infrastructure, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/strik?keyword=atividades+de+alfabetiza%25C3%25A7%25C3%25A3o+1+ano+para+imprimir+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8384d2c2-81f6-4345-b771-bfbd86a75540/zonogaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a0f4ba1-a06a-4223-8b4c-c90c447b89dc/94361792162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905a4c21-839d-41bd-a2f4-49be47c2e343/dijidosi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fea8b90f-4df4-4041-8fa8-3fec2599b3a1/vufodejasiwapono.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8699/5863/files/android_windows_10_apk_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5578/2819/files/sibubapusa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2009/0535/files/2019_excel_calendar_template_one_page.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/pivofalotu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6208/1174/files/best_sheet_vinyl_flooring_for_bathrooms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0463/2998/files/former_employee_reference_letter_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6153/5132/files/bagpipe_sheet_music_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/cuisinart_coffee_maker_clean_button.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3659/7663/files/92612804272.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3762/0381/files/rangasthalam_telugu_video_songs.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1161/2572/files/calculus_chain_rule_problems_and_solutions.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_off000070d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70D0 5980 bytes
SHA-256: 058a56279a24fdea03f3b809b1dd3bf58d2ad7d0475e34455f2bf1b2c61614cd
font_01_sfnt_off00008496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8496 12540 bytes
SHA-256: a7b6c597fddb251fc2200e174a121c0cac4eb1ed5e78b4ba2fe7d230de237135

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