Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5da7a4382ca26ab…

MALICIOUS

PDF

41.6 KB Created: 2020-10-04 18:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 9b75cf347329fe5f50fefea4267249ad SHA-1: b469452a5f1da8204d097a591d679c77fb45ce18 SHA-256: f5da7a4382ca26ab84383a1531f6882999a10f9c3a8e2a80d8f25d9fe5840e9e
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/strik?keyword=platinum+rom+hack In PDF document text
    • http://files.huronvalleybaptistdistrictassociation.org/uploads/1/3/2/8/132814342/nikenokinopebe-kazegu.pdfIn PDF document text
    • http://files.hepworthchurch.org.uk/uploads/1/3/1/4/131406843/kawutulapevepivi.pdfIn PDF document text
    • https://site-1040178.mozfiles.com/files/1040178/77790346642.pdfIn PDF document text
    • https://site-1037037.mozfiles.com/files/1037037/25418964738.pdfIn PDF document text
    • https://site-1040038.mozfiles.com/files/1040038/38956888927.pdfIn PDF document text
    • https://site-1042199.mozfiles.com/files/1042199/filigide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/53124c6a-3af6-49bd-a632-b757a7e92829/87537328785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7fee5b-5250-40d6-8b9b-88caae03ca55/59139719276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed257dca-4020-4d86-b5e3-7c7f53910b43/96279106813.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8827f41a-9f34-468b-965c-903d36a051f1/73247396763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26692907-4728-4d4a-9bb6-62e0a7660345/38874043832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87c5859-af82-4c06-8a40-9b04480a33d3/mixogifot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63b26a23-65a7-4f61-b76f-f35e9d89972b/87815447414.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f42831bf-4cd5-4141-9587-9a4a2d60f819/66418573510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11e6d4d5-ee70-4f44-a231-050f8048ae30/rukuja.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_off00006554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6554 4924 bytes
SHA-256: bb803e7f9ec78c7365318c563cda9466e1e06df471929874d3286ebaf73bd4e3
font_01_sfnt_off000075e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75E8 10632 bytes
SHA-256: d832041f828414c3a357755f11344617a7ee049f706e65fbfe1aabdf6e9ccaa2

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