Malicious PDF — malware analysis report

Static analysis result for SHA-256 98503e51056a5710…

MALICIOUS

PDF

42.7 KB Created: 2020-10-11 03:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 3f7ba8a63e27669a19d38fe12db6a9c9 SHA-1: ed03359ec87c9da73e6338abc7cc08ce7117d73c SHA-256: 98503e51056a5710a8f3ebdf51bdb32490889b7df51c8f0f9fa5b4a6a260f702
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/strik?keyword=only+the+paranoid+survive+audiobook In PDF document text
    • https://site-1038573.mozfiles.com/files/1038573/59491526669.pdfIn PDF document text
    • https://site-1037833.mozfiles.com/files/1037833/zuzenaxujixikejajanuxu.pdfIn PDF document text
    • http://files.nomadicsteve.com/uploads/1/3/1/4/131437538/42cb4690f8.pdfIn PDF document text
    • http://files.djdesignsbrooklyn.com/uploads/1/3/1/4/131453807/8363551.pdfIn PDF document text
    • http://kofel.writingtotheworld.com/uploads/1/3/2/7/132740708/6145278.pdfIn PDF document text
    • http://lukoki.thedieselphysiquellc.com/uploads/1/3/0/7/130740492/592b87d6.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/1/0440/6899/5224/files/thomas_lux_refrigerator.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/9045/6991/files/kirikiroid2_apk_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9548/5352/files/rafuvuzadeguzafiwugukula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8477/3029/files/ac_moore_frames_coupon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3950/4022/files/similes_and_metaphors_worksheets_grade_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f915982-b19c-4924-8243-da2d51d368df/larezilodipononabo.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_off000067d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67D1 5440 bytes
SHA-256: 5583ea123b6c5039291a8a9a50dcdb6bcdbb134f3b3b4ee971f332df677efc80
font_01_sfnt_off00007a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A45 10400 bytes
SHA-256: 4f20c9c9dd64fab3b5138655c0cc80251ee0d83c0df44c8391e9d43d08338f28