Malicious PDF — malware analysis report

Static analysis result for SHA-256 a62aab1ac55511ac…

MALICIOUS

PDF

42.6 KB Created: 2020-10-08 01:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 630963752f9c6049d07cfd2f972556b0 SHA-1: 704930581a1f67d0d61f98416f73c3eb89f84b0f SHA-256: a62aab1ac55511ac1cf032ebb91b93a3082dc39c0f0128c51833fd47e9fd9c04
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=3.1+solving+linear+systems+by+graphing+worksheet+answers In PDF document text
    • http://fulakevu.pablofernandezpt.com/uploads/1/3/1/4/131406274/tubaz.pdfIn PDF document text
    • http://japutemux.eyeonit.com/uploads/1/3/0/7/130775643/167050.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/31711359-7851-4c60-adca-8e14a40111c0/lunubuvezewemov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38157ac8-1c27-4838-9ffe-c7471731a172/gulipalidezerabufusine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66dd4494-b5e6-44e7-81ec-4ccbe808ea69/18583051274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f09ebd-38a3-4ab9-9359-65302f062eeb/zosawam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0d3403c-51e6-4b89-933e-c7b8a6ebbe6f/dumurutuxojuxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df385e9-8105-43c2-b55e-c6f80b1d46bf/jezes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7189d61-ec21-4094-b0c3-a3cfb828b8ec/13247437108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e43102-7abb-4397-b377-1c90b68afc92/79088275844.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000596b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x596B 5632 bytes
SHA-256: 67a2c2044e8bd3a002b3b0457c328beba93f6af1a84459b2663db57e8aa1fa96
font_01_sfnt_off00006c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7A 10272 bytes
SHA-256: df104839f329dd207da56dd8549616a0da85778e64fea9607d563c5d1d5314dd
font_02_sfnt_off00008f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F94 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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