Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9a9b3c5808d542…

MALICIOUS

PDF

51.3 KB Created: 2020-11-03 00:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e0e8488a9e2647c95d5343d3bac5f66d SHA-1: ef98eb5ea753f7574e1a72a00a7f817e7fc3a964 SHA-256: 4e9a9b3c5808d542a8a7fb63f14d2b050447d5ab99a15dfcf2aaf99e47a23564
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute further 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://ttraff.ru/123?keyword=adversity+definition+english In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379474/normal_5f8c129d72090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375357/normal_5f896326d0eec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f896e79829ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368997/normal_5f959ab3195d4.pdfIn PDF document text
    • https://lerinajivawexof.weebly.com/uploads/1/3/4/3/134327174/tafaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_5f9f99a11c23a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_5f9132eed02cc.pdfIn PDF document text
    • https://xoretesani.weebly.com/uploads/1/3/4/3/134315313/3b59a1e5fda57.pdfIn PDF document text
    • https://pibemalogodozod.weebly.com/uploads/1/3/2/6/132681910/xelevudirugizo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_5f9317e3337ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f8c21afc522d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gozega/sazisa.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/kirunadamitemuzeputasar.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000628b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628B 4896 bytes
SHA-256: 15fbec6d8f1b0d1bd7cb706161ec3573eeae88c1bb3e1eac39fe4e9c1bd847f5
font_01_sfnt_off00007336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7336 11880 bytes
SHA-256: f553e01f42726b4eb811214f3663b790d4a9b89c00bdc1f1e1ccf8af2f482984
font_02_sfnt_off00009b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B88 16060 bytes
SHA-256: e02432191d952bf4ca0be4cfeafc10308785ce9d9f3781c3262e4e8a73b31f63
font_03_sfnt_off0000b01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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