Malicious PDF — malware analysis report

Static analysis result for SHA-256 6947d2dd1dcb6f0e…

MALICIOUS

PDF

44.3 KB Created: 2020-10-03 00:47:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: db73936e4202b272b106bfee770731f5 SHA-1: 0cb57023ef729a53fbc67cdf4a8926a2a2cd4f16 SHA-256: 6947d2dd1dcb6f0e76e541794fc4d6845345c02cdb0727d9157527711a53768b
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=class+8+maths+factorisation+worksheet In PDF document text
    • http://files.arisharding.com/uploads/1/3/0/8/130874305/wikawuzoz.pdfIn PDF document text
    • http://files.templebaptistchurchdq.com/uploads/1/3/1/8/131856574/jewipa-tejadimexokijax.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/51013eed-c520-4110-a735-890b887fd241/zonomegumotawumireze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d78658a-1849-4500-9763-03ff16e2f019/zefunafige.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d519f4a4-9ed9-4efe-b286-fa244c19dff6/93189631366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f918144-9d12-402a-a752-920d7811676e/91966717670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c13c79fd-fe29-4692-9fb3-852574ea1919/93071830985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa6dab08-80bd-4306-aebe-48adcfeb5182/womozujitoridaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50a5d1df-20cd-440e-80ca-3b0e6af8a3b8/xadukari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f2fc4a-b732-4a51-8c19-e9c11b31a49a/gemokuwowim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31c59415-d1b7-4869-9969-c47d73b6a97d/82744872408.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_off000063ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63AB 5376 bytes
SHA-256: 72142af995526e967540d453a40e713c32e8d154d9ccf18bbd8818eff6f1e99b
font_01_sfnt_off000075d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75D7 14588 bytes
SHA-256: 071a4ec335398ba0a2ed1def3b388f717502020fb12313cf094e0acaca5ea40e

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