Malicious PDF — malware analysis report

Static analysis result for SHA-256 28af08d537102fc0…

MALICIOUS

PDF

38.9 KB Created: 2020-10-09 03:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 374626ec27c29b5f65f89b696c6df4bd SHA-1: ef63f17531cbfd558f793929fc641c149dd0f82f SHA-256: 28af08d537102fc0857968e5fe2573e573c8234247ac25e4a274ef37a7adaae9
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://cctraff.ru/pify?keyword=yo+kai+watch+guide+book In PDF document text
    • http://files.sugarlandcowboys.com/uploads/1/3/2/7/132712129/f9aa9.pdfIn PDF document text
    • http://files.tapmedic.com/uploads/1/3/1/4/131453124/bavabotodaniwi_tuzagemizu_jijidi.pdfIn PDF document text
    • http://rosiz.jogscotland-aberdeen.org/uploads/1/3/2/6/132681586/gakoxixu-kojapurogude-fodimimiwi-nepedako.pdfIn PDF document text
    • http://files.marvinsmarvels.org/uploads/1/3/0/9/130969429/57614.pdfIn PDF document text
    • http://files.jandabendquilts.com/uploads/1/3/1/4/131437513/piwitutaje-tulapoked.pdfIn PDF document text
    • http://pezikixod.carlotastewart.com/uploads/1/3/1/3/131397997/subuw.pdfIn PDF document text
    • http://files.hembladeacupuncture.co.uk/uploads/1/3/2/6/132682290/d1726d9d2c.pdfIn PDF document text
    • http://jelumozi.vivaluxx.com/uploads/1/3/1/4/131406688/popowotoninizideg.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/c07f058a-d835-4e6c-83f5-7a16fd3bd1e0/nakabutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fab2b13-97d5-4fef-8674-8a16a00a81e1/wolidivesekofoleti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c792cb-c207-428b-8895-8fc5956b82c1/16722984647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/ecology_vocabulary_worksheet_answers_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/7393495838.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9462/1862/files/45944763812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9423/7593/files/47564204088.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_off00005a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A21 5152 bytes
SHA-256: 7adf9d2f29162e34e3f3f6730e5ef0bd03fe5bde3d2694540ab7fd0af2d537fc
font_01_sfnt_off00006bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBC 10276 bytes
SHA-256: 8d9e56f255db193ae31f1fe8dbfa1675c3b757c654cda19c1c5c4d4db26cd83f

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