Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbcdb887f6dc4b5…

MALICIOUS

PDF

45.0 KB Created: 2020-11-03 23:51:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-15
MD5: f8e7784270565efeedae7c0b41b29dba SHA-1: 72f702e411564547620d0a8d6789695dc5fc5c3e SHA-256: bdbcdb887f6dc4b5f93ef8e9bc17e120e0d655d60310f1d3d9a706780459f626
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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=rpc+vs+rest In PDF document text
    • https://xabopefasuliwik.weebly.com/uploads/1/3/4/4/134445681/vanofasexulewi.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/24362886df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393911/normal_5f987b373122b.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/6e8ae596-111c-4a6c-a360-00f83bd480a0/62061686638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9d4a22-b8c7-42d5-a4c0-572d4c6ab81c/5486758947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16936c05-c98d-4939-906c-11a1794b4682/bitmap_brothers_gods.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/677fad96-ca9f-4941-be1a-77e2358b7815/zovidokopojafezazewetaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52d2f71-2f65-4fd7-86c1-9fbf2a5ef9c9/67413584041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/553c191c-5109-4697-85e4-48720585e309/jim__nicks_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e21e41bd-21ba-4f08-b2ce-eb5b4ab7e120/sekede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e97a120-be94-4764-b14d-2d5a9adb41ca/sifufonovugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f1ca30-1a14-4a1b-9ac7-7fed16849557/88006442916.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_off00006fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDF 4752 bytes
SHA-256: 4d3051dabfc69505226ea33d16f48c371de827f1e83527b20c1f73ee78b0f381
font_01_sfnt_off00008027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8027 11620 bytes
SHA-256: 15116e09fac811a5a56c93bf57948d340db21ef2998c214745c5afd82afadaa3

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