Malicious PDF — malware analysis report

Static analysis result for SHA-256 385998dcea2c688b…

MALICIOUS

PDF

41.8 KB Created: 2020-11-09 04:58:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 8e347ce3afe6e32dfc4c4b239fc9a5db SHA-1: f201404a7dd65d17242f58541731efc54249d61e SHA-256: 385998dcea2c688b91dfecacddef18d4066720ac578d537b80eaf66cea2a8754
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://traffmen.ru/aws?keyword=york+diamond+80 In PDF document text
    • https://bowiromifax.weebly.com/uploads/1/3/4/6/134613330/fodanufaferi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370273/normal_5f8b382491e32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_5f99a333547af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f96c73b842e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f871f0e4ba33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xelinatuki.files.wordpress.com/2020/11/12873235441.pdfIn PDF document text
    • https://sudufafi.files.wordpress.com/2020/11/nagosevanuwize.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/pengertian_bronkopneumonia.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/ethiopian_grade_12_biology_student_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/intellect_devourer_5e_reddit.pdfIn PDF document text
    • https://gokugilevipo.files.wordpress.com/2020/11/39682992450.pdfIn PDF document text
    • https://sizomem.files.wordpress.com/2020/11/cactus_mccoy_3_game_free.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_off000065bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BD 5120 bytes
SHA-256: 8aaa9676d6ed249cb1e8f5d748beee615683a91f8f1b5839d720b54a594b31c8
font_01_sfnt_off0000770f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x770F 10608 bytes
SHA-256: 562fd4f72f41acbda62856f086d35ce9bd22156510594bc8902f9bb0ae3e6841