Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f9bca921e462a54…

MALICIOUS

PDF

63.3 KB Created: 2020-10-23 15:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: f25d0c6bc695e55481b9d20df1a8b641 SHA-1: 3b2bccb928dba7515d3bdded3e6aec7f7438e83f SHA-256: 8f9bca921e462a54dc73f8592f44c610f2a0bdef938ef7b6d04aa27b4edb6a92
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://ttraff.me/123?keyword=transformador+de+corriente+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f8d1d8232e44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369765/normal_5f8f754d54d3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f87feabe1121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f8eaed24ad88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f8861c7627a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f873f3081803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383295/normal_5f8bdb2eb549d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405190/normal_5f92363d8de04.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_01_sfnt_off0000b6e4.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_01_sfnt_off0000b6e4.bin)
    • https://cdn.shopify.com/s/files/1/0486/0087/5173/files/powered_gm_cardigan_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9634/1153/files/kademumedofafumorisevok.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3129/3863/files/85866687567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6368a6-12bf-4856-9595-45c891dfb636/ruziwetapovokabiperi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119255f4-c131-432b-9a48-5ba822fb6e55/caracteristicas_de_la_participacion.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/46676817651.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/tupodomutuna.pdfIn PDF document text
    • https://s3.amazonaws.com/vixuwogetiv/puxodudafujetusuxileliju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5587/3190/files/wemufedavinip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4647/5675/files/77947891379.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 extracted file (font_01_sfnt_off0000b6e4.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B46 8364 bytes
SHA-256: 4964c4c0acf631362c199a5fe2796ba0b263124380eaf3f169bac7ac20427492
font_01_sfnt_off0000b6e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E4 5220 bytes
SHA-256: 74e1354b7f86be6a8f3872aa6e014a4a5e924b5e07e0bc7ba7ca97aa854a9098
font_02_sfnt_off0000c88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC88C 11508 bytes
SHA-256: e786a61fe72ed3eb43f72628a440378cb26cf076df44a4d428f777c1fda997bf