Malicious PDF — malware analysis report

Static analysis result for SHA-256 593d3f1e199ec519…

MALICIOUS

PDF

56.3 KB Created: 2020-11-04 10:21:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b12beee4a34725eede22abcc336e6873 SHA-1: 30ab0b9c228d571d81fd77898bba32239cefa8ae SHA-256: 593d3f1e199ec51957e6dce2af46cd234a3e2bb70c81e8039b4abb7320f9a6dd
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many pointing to external PDF files, indicative of a link farm or SEO poisoning tactic. One prominent link, 'https://gettraff.ru/aws?keyword=quotes+from+to+kill+a+mockingbird+chapter+29', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the primary purpose is to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://gettraff.ru/aws?keyword=quotes+from+to+kill+a+mockingbird+chapter+29 In PDF document text
    • https://xalusadi.weebly.com/uploads/1/3/4/5/134595224/nepefiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449781/normal_5fa1a13de6ca4.pdfIn PDF document text
    • https://zatafepe.weebly.com/uploads/1/3/4/0/134000007/2492204.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_5f8b9069148fc.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/likal-damaxawi-kakoguxuratisiv-dobutivigila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384050/normal_5f9f2c2b55c4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418981/normal_5f99004e5735a.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/02dd022b-daee-45cb-b526-a8fa76641c4d/13409255039.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/1642/3077/files/befogezigenolokusuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5861cc9f-2d64-4a25-ab2c-4f33e76f13de/muxifakuwid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b895a21-6a74-4843-8ce4-9da5bf431f0c/tuweboremelabudewerovik.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_off00009c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C60 6120 bytes
SHA-256: daca732e2abe324f2544483120ca1faa60d6678060a840e3e655aff8d67c563a
font_01_sfnt_off0000b101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB101 10356 bytes
SHA-256: 0d59705ad204d4d50c67c92c3e173a5e68630bb62cb3e1ac97558d534b2b1032

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