Malicious PDF — malware analysis report

Static analysis result for SHA-256 1961cf6a89dcc973…

MALICIOUS

PDF

39.9 KB Created: 2020-11-02 09:56:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 0ed731cd822673f3f48af2f8f01c9a5d SHA-1: 614cba1a4c3a721bba217510c191ec817015c236 SHA-256: 1961cf6a89dcc973fea69ff2316bf6db362711b42dc712df36b2ff3d3c16f20d
142 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.
  • 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://ttraff.me/123?keyword=minecraft+mod+apk+all+unlocked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f9e0747cd973.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/1606659.pdfIn PDF document text
    • https://tegugozitofo.weebly.com/uploads/1/3/0/8/130874592/badeluzasezorak-tasowatiwefij-xapojefasij.pdfIn PDF document text
    • https://pibemalogodozod.weebly.com/uploads/1/3/2/6/132681910/sajawedos.pdfIn PDF document text
    • https://modatubegawaso.weebly.com/uploads/1/3/4/4/134491319/6283581.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408858/normal_5f9462f403c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374522/normal_5f8c018e93812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387918/normal_5f98414ea9f46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/38635641313.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/zopivikixabiwinajok.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_off00005e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3B 5192 bytes
SHA-256: 032cfab5a253865291c246070c8d1ee6c938a74ef42d6d739803b2446fd15e7d
font_01_sfnt_off00006fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE3 10452 bytes
SHA-256: abca3627f080129e774103d5957c183bb43a6aa458a3edebbd6ddd69b114cd50