Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7acd6d0bad8ddee…

MALICIOUS

PDF

44.8 KB Created: 2020-11-01 04:33:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 62607414f89a804dbd6dec823f0e2aa2 SHA-1: d229940e70906cc13428ecc23bc97921a7bbebf2 SHA-256: b7acd6d0bad8ddee81f78f1f4abf1299b904bbc4f6cc83f54f2b33563afb4ff7
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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://ttraff.ru/123?keyword=usa+sex+guide+myrtle+beach In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379229/normal_5f8f3de92d7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5f98c912635a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_5f94c1fb94f55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5f9250cd9e6c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_5f9b6243edc2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8817ee9467c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f8815e75b189.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/1/0504/8408/4898/files/the_production_possibility_frontier_will_not_shift_outward_due_to_an.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3925/1870/files/fileselojuwoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8971/6134/files/resize_mac_preview.pdfIn PDF document text
    • https://s3.amazonaws.com/gezejoputiwinu/lisik.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_off000070ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70EC 5656 bytes
SHA-256: 0561a664b740533680847a901acfd67caf9d836fc278a5aba95b94acae5ba0f7
font_01_sfnt_off00008403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8403 10188 bytes
SHA-256: ca2d46df748b37c7aa527cb9559df999b56347e7964b4c23bdae03345ec3883b

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