Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7b5ae2d78473dd…

MALICIOUS

PDF

42.2 KB Created: 2020-11-06 15:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 333706334c9bd4f329eae117c09791ad SHA-1: 1867d644acfbf2a9b85a37caa1854c724c0ef4bc SHA-256: df7b5ae2d78473dd8ab7022312154618e96f0147e880c4fc85ae4edd5aceab9a
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, disguised with a lure related to downloading an Android application. The ML classifier strongly indicates maliciousness, and the PDF structure includes a large number of links, suggesting a link farm or SEO poisoning attempt. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

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://gettraff.ru/strik?keyword=whatsapp+latest+version+apk+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f89499ea571b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f888d9b87e3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426814/normal_5f9bb5ee145b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_5f93d7cfd95c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f8d05013ef0b.pdfIn PDF document text
    • https://lodirunesu.weebly.com/uploads/1/3/0/8/130874391/jobajelilela-fikisivonim-sujuzu-dewajozexazaju.pdfIn PDF document text
    • https://banodita.weebly.com/uploads/1/3/4/3/134311275/7859a42f3036.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/tofizo/mt_juliet_high_school_football_tickets.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/skf_bearing_units_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/salade/pinckney_high_school_pinckney_michigan.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/62412049191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/200f8f64-1af6-4ef4-95ba-fc0261c161fb/10560501440.pdfIn PDF document text
    • https://s3.amazonaws.com/regufojalojaza/redizepo.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/42328619917.pdfIn PDF document text
    • https://ralejub.files.wordpress.com/2020/11/io2f2_lewis_structure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4286ab5f-081b-496e-9771-3a073c9810b4/the_man_who_planted_trees_book.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_off000066a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A4 5184 bytes
SHA-256: 31f4a46e11ceaefecb703c8d0c7056056fb5f95fa733bf7798fe6ce7912ffe39
font_01_sfnt_off00007850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7850 10720 bytes
SHA-256: 61a2c0e0d9a27d6452e77dfa1ad29c8e6fe1e11c9e109e5a875f646b6b67eccb

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