Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aca61bb9b80af69…

MALICIOUS

PDF

42.1 KB Created: 2020-10-08 05:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c89f26875f7606636a424cbcc808d606 SHA-1: 86949a4cfa08f4afd1dfe055699ec18c163f01ba SHA-256: 3aca61bb9b80af692004c803463636dca488954ad875c90f2d1eb5bf04fe247f
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=saxon+math+algebra+1+2+pdf In PDF document text
    • http://files.gascevicius.com/uploads/1/3/1/1/131164034/dafoko_sekepomikaki_fitiv.pdfIn PDF document text
    • http://mixij.stephenbeaumont.com/uploads/1/3/1/4/131437046/7371549.pdfIn PDF document text
    • http://sazozi.steinbachcommunityoutreach.com/uploads/1/3/1/4/131482975/8c1d8f.pdfIn PDF document text
    • http://files.marylandbuilders.org/uploads/1/3/2/6/132681194/vadigux.pdfIn PDF document text
    • http://files.sound-revolutions.com/uploads/1/3/1/0/131070776/82410437e.pdfIn PDF document text
    • https://site-1040794.mozfiles.com/files/1040794/nakozepigatudonipuxomuw.pdfIn PDF document text
    • https://site-1037881.mozfiles.com/files/1037881/1847612540.pdfIn PDF document text
    • https://site-1040104.mozfiles.com/files/1040104/59517327939.pdfIn PDF document text
    • https://site-1039179.mozfiles.com/files/1039179/vovixebusuwo.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/1/0431/2177/0656/files/3ds_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8995/9843/files/3989960183.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7743/4525/files/rosamefofoze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2512/0411/files/maria_callas_herbert_von_karajan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0573098f-c7f9-47ab-b47a-0d297b52324e/23474438553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a45aee97-85d2-4230-9fe8-c5d3d2e402a2/3556710025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048e4904-3877-4a0d-abe8-15018dbf05d8/jipegogikexojipuxor.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_off00006494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6494 5772 bytes
SHA-256: 8497c76cc876ad4426a7b9636a6b586ca36651dc871bc23daec8a145a601f714
font_01_sfnt_off0000781b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x781B 10512 bytes
SHA-256: ef223015b2bd4b2d4151b350e03ba21d9b4d3c16736f8a1c01e699c08d61f3a2

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