Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e56be4291da190…

MALICIOUS

PDF

37.5 KB Created: 2020-11-04 14:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: c84c28f04574fad4a0165699d37f1e98 SHA-1: 0e4dccf239a9fd8e51a3191f706e37cfea65e9ae SHA-256: 90e56be4291da190dec44cd4711c2f67cd617d4c5c5b9adc123a31d70d0cde3b
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://ttraff.me/123?keyword=ngay+tet+am+lich+cua+nam+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5f8c6c6aa912f.pdfIn PDF document text
    • https://guxewegitonis.weebly.com/uploads/1/3/4/3/134336720/7211967eea50e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389599/normal_5f8df71cbd566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367944/normal_5f8759b9e0274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388157/normal_5f8e6e0f76f4f.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/e89f6616-a11d-4b21-91b2-340616ecddc5/kukifavovesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e88ef9f-eeec-4053-8a40-18f4b4387deb/sefibafaxisulifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421ad467-e030-4b19-8f9f-f089f50f8c17/nezurukafekasuvone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fc24916-f834-4398-b7ba-882783b10616/lizegape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd16d8fa-5864-4273-85f2-cba7657aba9a/matisusovarakavumiwoma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f462b543-b37b-4be0-9e51-21127a6fc44f/like_water_for_chocolate_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/fajonubinomeder/afaan_oromo_english_dictionary.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_off000054f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54F5 5284 bytes
SHA-256: c38141cd529381003beedd67043bff7fb80ec4ade0ac8f1612c08024c7465b0f
font_01_sfnt_off000066de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DE 10188 bytes
SHA-256: 5f5fafb55c986fa91b1f45c7d660f2b92f55995544d017b210ae5a85c20e0d4a