Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac32ceede53ea8d…

MALICIOUS

PDF

52.6 KB Created: 2020-10-06 23:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 201d724c6f7516d704455557afd01402 SHA-1: e75a693cddc0b0673523feee5724f5b3f359c2ad SHA-256: aac32ceede53ea8d279d540a4fed5efae3ac539eb94ddca508d65cc859f0cba7
210 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ca+ipcc+gst+amendments+for+nov+2018+pdf In PDF document text
    • http://girerab.thethymetreatmentrooms.co.uk/uploads/1/3/2/3/132302921/231f7.pdfIn PDF document text
    • http://sovoxadax.thepianoandmore.com/uploads/1/3/0/8/130873848/5979071.pdfIn PDF document text
    • http://files.ionoptical.com/uploads/1/3/0/8/130873804/dawefaderupala.pdfIn PDF document text
    • https://site-1042279.mozfiles.com/files/1042279/44814974060.pdfIn PDF document text
    • https://site-1038313.mozfiles.com/files/1038313/41987070736.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/06139813-8d2e-482e-a9ab-042cd38ddfdb/62421833175.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebaddbf-b5d4-4527-b076-1f445d4d061c/budedokitobifivul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d670441a-8a0d-428a-8d50-b624019f917e/gujuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aba0a64-eb04-4c11-a5da-899e45894d8a/11660124552.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bb8413b-8c6d-415e-8c60-9a72870f2e41/37631710472.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1b6081f-a961-48cb-becf-8ea6bd7483e4/6698616132.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_off00008efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFD 5928 bytes
SHA-256: 3f8ea20866ff8bf63e89f0014b5832ac7bb8b82a78bf60f73886cef3901ac64d
font_01_sfnt_off0000a31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA31E 10092 bytes
SHA-256: 4fea5631ae74acd400f83d7588810db075b0d7049b3f1744a3230010518408b7

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