Malicious PDF — malware analysis report

Static analysis result for SHA-256 516943fc8c86c75c…

MALICIOUS

PDF

42.8 KB Created: 2020-11-03 15:41:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: be927da43e7a6173a7f20cf55fe0a635 SHA-1: 6a9fe744abde6dbe04b43ac4f5341498fa41c0b2 SHA-256: 516943fc8c86c75cc10c29c32c548fbd98f0babb735d73fe67cfff26a3b24e6d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to mimic search results, likely to trick users into visiting malicious sites. The ML classifier also strongly indicated maliciousness.

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/123?keyword=deadpool+2+full+cast In PDF document text
    • https://wetuwisiw.weebly.com/uploads/1/3/4/4/134495793/biwukakofexuxenuxe.pdfIn PDF document text
    • https://wevuviwujito.weebly.com/uploads/1/3/1/6/131636984/16986831e0.pdfIn PDF document text
    • https://sexutenevasasi.weebly.com/uploads/1/3/4/3/134306733/xepokav_tokefi.pdfIn PDF document text
    • https://zifidobu.weebly.com/uploads/1/3/4/3/134371145/5797331.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/loxopudizus/john_deere_4010_oil_capacity.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/fekewiwilawixujubujot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f6d18a-4e8b-4d2f-b1fa-e2732e9f6b68/tivitajitag.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/cdigo_penal_comentado_bitencourt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1498f1b6-0277-42bc-884d-70bd66ae3a6d/jumunaxanuwenonaxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/402b32fe-0502-4e1f-add4-07f15adcf649/86721423312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6306060d-3712-434f-82e6-0a04b0edd6a6/81804644261.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18098c61-e311-4859-9746-593eec850d82/91649986056.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_off00006779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6779 5184 bytes
SHA-256: b85196c8c30b59bf5c8b60ab356ffa568431ef85aaf2a905af5fe1f83a62c708
font_01_sfnt_off0000793f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x793F 11236 bytes
SHA-256: f12ce4e0017bfc771fa1639b4515a6457ad4b29cb988984ab3bf16d838e94318

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