Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aec33a00de7e13d…

MALICIOUS

PDF

49.0 KB Created: 2020-11-03 19:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e1c0837bea6bf90a62890ca1cc5d0ead SHA-1: d0f656bc80242918db9ee1b02da9b13e77e0504f SHA-256: 3aec33a00de7e13d69a99c7acc5b8e033462122f13c55f698ac600d885e13719
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://cctraff.ru/strik?keyword=mom+and+boy+quotes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373259/normal_5f9b66880d291.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392452/normal_5fa129ee5d68b.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/4995129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444351/normal_5f9f43d6a8dc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f9ed11252660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8baf3e20178.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f8c4b32c03e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_5f9237dd4529d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_5f9ef1ef81fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f901a3a1497f.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/porukofosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_5f8f535ae505d.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/0edfee37-04df-487a-90b5-0f66146979be/95231329550.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/bardo_thodol_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/borderlands_2_randomizer_mod_multiplayer.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_off00008361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8361 5216 bytes
SHA-256: 3f6125447a9fb27a39e9c5de6115ac7e21f24a1311a37b54417683f93d19a3ab
font_01_sfnt_off0000951a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x951A 10144 bytes
SHA-256: 96bc668c685f3b105a32db504a4434da0b3ef5b235ffe9736c3bd613111a6f57

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