Malicious PDF — malware analysis report

Static analysis result for SHA-256 257c8eee8c925fc7…

MALICIOUS

PDF

108.9 KB Created: 2020-10-29 11:42:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 20c84663c7528606c5747a4d16aacd4a SHA-1: de4bf5a90408409313843bb52f5088adfe76dd08 SHA-256: 257c8eee8c925fc745b0cf0f4c8db0bd438cdec710cac8a22df7f5fc6161c9f3
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://ggtraff.ru/strik?keyword=pp.recode+hollywood+movies In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f87f7e6165e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366005/normal_5f89e3962a3c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5f923b344857b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379476/normal_5f93237766a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f8ea83e2d2cd.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/1/0504/2972/2774/files/67464341419.pdfIn PDF document text
    • https://s3.amazonaws.com/vokeri/xavaxujal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7732/9586/files/serotonina_libro_houellebecq.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0307/4469/files/jim_morrison_anne_robin_morrison.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/7244/4328/files/poronewawipuxepazej.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/59208048065.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/jepifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/0518/7512/files/castle_crush_mod_apk_hack_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/3398/8767/files/56764470813.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/340611780.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2314/5896/files/light_dependent_reactions_worksheet_10_answers.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000176e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x176E1 26420 bytes
SHA-256: 80b9c5e3fafc3a1120355c02ef94ddf7e1ba21ad311b28dba6ced5492202498b
font_00_sfnt_off00013b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9C 5392 bytes
SHA-256: 55e2e73bcb3d239a96b22c5c4000f51779306b7317eefeb69d51eaea6f6e6c97
font_01_sfnt_off00014de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE9 12032 bytes
SHA-256: b49b5e27c72b067d76091189d14651c965868545748632fa249654f3d1c2ad74

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