Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5fbb497c52683b…

MALICIOUS

PDF

40.6 KB Created: 2020-10-11 10:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: f8b0ef324a1fe3f05d9a3b0ece531d42 SHA-1: a162e68b762e67b2811abe81ce4935e0e0d76f5b SHA-256: cf5fbb497c52683b97577ac594dcaa805cb746834e574f782ebffda9c2ec371d
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://ggtraff.ru/pify?keyword=life+expectancy+line+graph In PDF document text
    • https://site-1038504.mozfiles.com/files/1038504/wetorowebo.pdfIn PDF document text
    • https://site-1042670.mozfiles.com/files/1042670/xupezoreparoxufasuzad.pdfIn PDF document text
    • https://site-1041932.mozfiles.com/files/1041932/xegezezuwanusofefofilu.pdfIn PDF document text
    • http://files.hrbi.online/uploads/1/3/0/7/130739835/8d26add29.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/1/0482/3911/6440/files/texas_go_math_grade_8_online_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7104/4770/files/antibodies_a_laboratory_manual_1988.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1453/5843/files/drake_trust_issues_album.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/3073/2949/files/types_of_tour_guide_and_their_description.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1966/3522/files/xegat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4233/5651/files/tomexajuvaboritibegig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/oblique_triangle_word_problems_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4531/3941/files/62664996956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8173/7393/files/13176857796.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_off000061ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EF 5212 bytes
SHA-256: 6770e0f6800e7ba5e9fb29669e6dad5029570e30cb01927af282f178b4270792
font_01_sfnt_off000073b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73B2 9948 bytes
SHA-256: b0e558e9cc490c6187a3f06d4f67feb9184e3a563e225e560015a67136b21231