Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9084b6af3ff0fe…

MALICIOUS

PDF

41.6 KB Created: 2020-10-31 09:16:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: f44b47114e83585b697328a8c27f19a3 SHA-1: 1b85f49351b65e4ccc656ee987c21efe2ac5261a SHA-256: 4a9084b6af3ff0fe302ab414c2a05c35122435be0072a82b481698ff6b0d8a58
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.club/pify?keyword=a+contractual+relationship+chapter+1 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5f90b1d1ddb68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426549/normal_5f9a303c54a9a.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/6938031.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/c5564b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_5f933eaca30d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f89fbdcae8a4.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/34422997-ca25-45bf-80dc-2278e700583a/xogorasiramurida.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/super_mechs_mod_apk_7.601.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3a9103-d52a-4be1-9aad-11e58f67aa0e/44358921176.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84050d3c-ff62-4249-8d76-e416d05e4799/66739929285.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/93972815500.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3210ad2a-0481-48e6-80e3-5dfcc4bd6962/vexudo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A20 2952 bytes
SHA-256: e211f2d6e0d1bf1fd17bd5150bc2724fb7c0f1d37b1c69b855d9dcad8de34ab0
font_01_sfnt_off000064ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64AE 5064 bytes
SHA-256: db26cb51c14bff597768610cf408b14d19bb53cbce6914c4ff832f29afaa6bc7
font_02_sfnt_off000075e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75E3 10348 bytes
SHA-256: bc2b44bf4f44882ef55cc4301042eae73ec7ca0d783853603e414309609d40b6