Malicious PDF — malware analysis report

Static analysis result for SHA-256 a038b58987c17041…

MALICIOUS

PDF

35.7 KB Created: 2020-10-12 07:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 8e76596989de739cf6ce4bbbfe4a3b9c SHA-1: 2b412fce24aee2b607f6f8bc395ec54f225ace22 SHA-256: a038b58987c170417eaa7bb068fb63c4117a8ad90a44546c23b1ad8116d78996
194 Risk Score

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://gettraff.ru/strik?keyword=baixar+o+livro+pai+rico+pai+pobre+em+pdf In PDF document text
    • https://site-1040036.mozfiles.com/files/1040036/48496776164.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/mexegexepas.pdfIn PDF document text
    • http://zijixoluw.tiinapalm.com/uploads/1/3/2/6/132696113/pebexupifefesoj.pdfIn PDF document text
    • http://files.hermitthrushhomestead.com/uploads/1/3/1/6/131637419/wobigapepo.pdfIn PDF document text
    • http://files.samthoughts.com/uploads/1/3/2/6/132696018/koxububo.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/1/0429/8588/1753/files/dragon_city_breeding_guide_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/2796/3293/files/vasagabufudafofije.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6940/2009/files/levine_protocol_heart_rate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4404/5468/files/buffy_season_8_library_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/6946/4727/files/xawanevexikupu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9249/9877/files/past_tense_of_shine_verb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9752/0801/files/dna_mutation_simulation_answer_key_biology_corner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/lalaguzolon.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_off00004a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A98 5440 bytes
SHA-256: ac5b0bd8f3e8b61dc73080eb9e174e4a5e8286b6f9b4e2788bfd881c32bebf18
font_01_sfnt_off00005d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D05 11512 bytes
SHA-256: 48b978f4020a4c820ac1ec9288621233c7c655ce0e740acf6e8b27c54a6bbd7a