Malicious PDF — malware analysis report

Static analysis result for SHA-256 2974f3884462bf59…

MALICIOUS

PDF

66.9 KB Created: 2020-10-31 13:16:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2338a71cad0ccc5ae8218cd4c2a6fed6 SHA-1: 795033d0eef1d92853892a5f04f6cd8faf06971c SHA-256: 2974f3884462bf59f5a1f434d0fdb2aa8e5e6a0bca5f500b59770bbcbe70076a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to distribute or host malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful sites.

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://cctraff.ru/pify?keyword=andy+milonakis+disease In PDF document text
    • https://varipejat.weebly.com/uploads/1/3/0/7/130739080/9334890.pdfIn PDF document text
    • https://kuzaloxamuw.weebly.com/uploads/1/3/1/4/131406684/3458950.pdfIn PDF document text
    • https://rebolotor.weebly.com/uploads/1/3/4/3/134364816/4529429.pdfIn PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/xenokudatadubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f8809ed9f287.pdfIn PDF document text
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/70fdf8.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/vazisi/cellulase_assay.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/5444583126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96bfdce5-c206-4f06-97ed-ee7af04029f5/how_did_voltaire_influence_the_constitution.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/concrete_microstructure_properties_and_materials_download.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/fosotiboboromil.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_005_off0000c9d1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC9D1 30012 bytes
SHA-256: 6d4e787ab9a2b8daa766b8e9c737db377a8f4075135a2a26837f0781fdb932e3
font_00_sfnt_off00008fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBC 5028 bytes
SHA-256: 6ab34eff09f7aab2acd8d8a00e2230ab8121dc5fa782e562a1d8a45d91b05fce
font_01_sfnt_off0000a0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA0CF 12004 bytes
SHA-256: c1a3e7314d817b236645838edfa65d5616f06970d11c8608d36ed3f366bec3e6

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