Malicious PDF — malware analysis report

Static analysis result for SHA-256 88cf55928b24e81b…

MALICIOUS

PDF

40.2 KB Created: 2020-11-09 11:13:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2022-06-20
MD5: 0aa42c3ef171d4ee3b0f82c3499cd831 SHA-1: 22001a9ccdf347d89b0287fb7296a6a7e965272b SHA-256: 88cf55928b24e81baea687dc79c92a4437c7a8a6aa5057feafc2be51bc098069
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://traffking.ru/aws?keyword=delta+flights+search+2125 In PDF document text
    • https://pesodubebugi.weebly.com/uploads/1/3/4/2/134234841/kowokejipejezoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f99ce0dbb48d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366011/normal_5f8708aaf1d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5fa59c53887dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418383/normal_5f970a864373e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5f9e75df4f6aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402710/normal_5f927e30876fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/suzitivasekoga/android_sega_genesis_emulator_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/wuvaketanokalunitobolo.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/33650607786.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/28168269303.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/tuzabotedenulewujuzudifa.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/receptive_bilingualism.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4792 5448 bytes
SHA-256: a45c32d74bc97d0ea45bac1874a242c171fb933439b04916433cc016a8a6a338
font_01_sfnt_off00005a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A2E 10772 bytes
SHA-256: a642002d5dee97b7d1a1890b9c1eb8e0c2b6e2c4dcf6b9bcc6916e969bdb245f
font_02_sfnt_off00007eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDA 16180 bytes
SHA-256: 70fd880a832187ea228bdebe56c8c7cb04f63ea63b694c382ca0baec40b8a3a5