Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4b5810b3e96999…

MALICIOUS

PDF

48.6 KB Created: 2020-10-28 16:56:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: bb3c65d415da07c021ea7bdf278b871b SHA-1: 940de7b62d59c9add309304f4e110b5558599706 SHA-256: cb4b5810b3e969995a3a580f388083de3e805dea5d9ea6cdab8fd4029848ae9e
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://cctraff.ru/aws?keyword=beatriz+mariano+okkultist In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f887da1d9302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383922/normal_5f91f772deeb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385026/normal_5f8e3402b4a04.pdfIn PDF document text
    • https://mutazodot.weebly.com/uploads/1/3/0/8/130874237/3368962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393190/normal_5f97a7458a942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374708/normal_5f9264f2d5d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5f874be78d4c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_5f890818d770c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_5f89281e1fdec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f92b0d8b84a9.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/f63a11f6e66d70c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f8907d07fbbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off0000626a.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off0000626a.bin)
    • https://s3.amazonaws.com/zirojopemup/gigezejuru.pdfIn PDF document text
    • https://s3.amazonaws.com/degerutisig/best_3_player_pool_games.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/zonurunatadosavuve.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0077/2246/files/fm_whatsapp_apk_download_page.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/jajitodidukomidimi.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_00_sfnt_off0000626a.bin)
    • http://dejavu.sourceforge.netIn extracted file (font_03_sfnt_off00009edf.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_03_sfnt_off00009edf.bin)

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000626a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626A 4992 bytes
SHA-256: 01458aadcc30d117907a2c7ccda26da4705212655dba09709b88d699dca934a7
font_01_sfnt_off0000734d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734D 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00007bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDA 10308 bytes
SHA-256: e694fb162c19edc1d563218e6e9a553eaa1e8ff6b3ef9109a8539b05082abff3
font_03_sfnt_off00009edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EDF 16312 bytes
SHA-256: 028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b