Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33c8cf32ac26a5b…

MALICIOUS

PDF

38.5 KB Created: 2020-10-31 17:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 52d7146846c19d386a8931f1dc539b34 SHA-1: 71d2dda0a3b044cb23861b4eac8f614a24332346 SHA-256: a33c8cf32ac26a5bd88747688ff158d3cd0542d22ef465a8b0d390b1c25734de
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=europa+universalis+4+install+mods+manually In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_5f93982055f51.pdfIn PDF document text
    • https://refanoripusegu.weebly.com/uploads/1/3/4/3/134306014/4218708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5f95b3bc4f739.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0677/0333/files/72412047241.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/poxudot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6937/4115/files/didizuvibuvogoso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/3433/5139/files/wudosikatumunupefek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7088/4514/files/cyanogenmod_11_camera_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jivala/xabosasaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2130faf0-e56a-4608-a1a3-d6ef79e6ade6/54752337970.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7070/8129/files/comprehensive_gynecology_5th_edition_free_download.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_off0000555d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x555D 5312 bytes
SHA-256: 8f99e2547dc87a2163c741b465b94d5ac92eadd64f933383925479265eec738b
font_01_sfnt_off00006768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6768 11064 bytes
SHA-256: 12bd6a82a90166afd9f31be484fd4ca1bf8d6d763f8fc2a22e6a8b6d217b5eda