Malicious PDF — malware analysis report

Static analysis result for SHA-256 d329ffd25a79b16a…

MALICIOUS

PDF

47.8 KB Created: 2020-10-29 01:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 423c57350ac2b53e534fdf071f7310c6 SHA-1: d7decca2b0d0fd1d1987caa4210eb7196b7985d9 SHA-256: d329ffd25a79b16abb58aee2550622677413cd70bde9f67214804565b932622a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is 'https://gettraff.ru/strik?keyword=terra+xehanort+bbs'. The document body, though heavily obfuscated, also contains this URL and other links, suggesting an attempt to lure users to external, potentially malicious, sites. The ML classifier also strongly indicated maliciousness.

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=terra+xehanort+bbs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5f93f82f9b8fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f8d0ee63607c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f938c119a034.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375509/normal_5f921330e029b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417809/normal_5f972188682e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f87412a3cdac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5f8c0d85e2f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367279/normal_5f94a7c71e869.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vopadofugon/1503220133.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/back_page_st_louis.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/biochemistry_free_books.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/anemia_dieta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6776/8981/files/asco_nausea_vomiting_guidelines.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1924/2152/files/38737191933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8762/5369/files/how_to_remove_background_color_in_word_when_copied_text.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/mokotevezumawugepegire.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/tennessee_immunization_form.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7054/6614/files/lenikinutetolumolavoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6626/1141/files/cpr_infant_and_child.pdfIn PDF document text
    • https://s3.amazonaws.com/petuzutemixuvod/anita_desai_clear_light_of_day.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/pekitisekuxa.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/82241560902.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F4C 4636 bytes
SHA-256: d3a483b02f2f275c1ab3e23a984c5434babfb0d8af0dc5e5b6d8d92cc39ada3e
font_01_sfnt_off00007efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFD 11200 bytes
SHA-256: 38cd63ee30e70bc3d4eae6f13e98a2034272fa0b4a57d7cc31abea0b5f04c61c
font_02_sfnt_off0000a3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA3AB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2