Malicious PDF — malware analysis report

Static analysis result for SHA-256 233908aace6f87c7…

MALICIOUS

PDF

68.1 KB Created: 2020-10-01 22:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a65187ef40f3b484ec7cf16817c6e7be SHA-1: badae2cbeb6c685302c634f99f2691166a684667 SHA-256: 233908aace6f87c762b186882d988f2030b6f2f81a3c6a5ed58a724c687d099d
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://gettraff.ru/strik?keyword=acta+constitutiva+de+una+empresa+constructora+ejemplo In PDF document text
    • http://rupezus.techfrood.com/uploads/1/3/1/6/131606165/borupesu-warogol-piworafuredogim.pdfIn PDF document text
    • http://files.andridgesoundhealing.com/uploads/1/3/1/4/131408092/4706811.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/f3b74252-df66-46e1-a327-766b4d0b33dc/14755705498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a12a4f6-9e18-4ee1-b9d2-0e5ab19eb2e6/37552202626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6521c45-67ef-469d-8170-34c8428ad54f/mugigamowujijesawezoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd7d7624-af92-4181-ac01-fe0d51bc2168/24663089674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23110c98-7701-438f-b375-c81374123ae7/48436397785.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52a1ed4-1472-43f7-a81e-2a29d39c6361/75125794284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e402c799-b37a-44a8-8111-804d0eb5d33e/43142434822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31cfd1a-5dd6-4a90-b76e-2ca415d2c801/pikegedulugetotawatis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84179940-f0a7-4056-8c00-dfa98b578f4b/xadetidoxijikafotutom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58d23d37-5cb2-46c5-9e5e-5649b00c4aac/kurodebab.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_off0000be80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE80 5344 bytes
SHA-256: ff987213b829ca90ad8fe22c98630e0d648f036e8ddab163797043e5560cec6f
font_01_sfnt_off0000d0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A0 16612 bytes
SHA-256: 52c6a3146ef13c0ef660d999e9607f83a3e584f53934dbf61113bee836c2006b

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