Malicious PDF — malware analysis report

Static analysis result for SHA-256 948d554fbe1fdb13…

MALICIOUS

PDF

45.5 KB Created: 2020-10-28 13:45:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 52b0028644127f641471d6e8ee9c57fe SHA-1: 10dbf3c0858d119e51f40e79f7f8f594f20cc69c SHA-256: 948d554fbe1fdb13b7e913753bd275c1e65f9a34482df334e2c518db89febe7b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to mattress reviews and a URL that appears to be part of a link farm designed to attract search engine traffic. The presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely to redirect users to malicious infrastructure.

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=twin+simmons+beautyrest+beginnings+plush+mattress+reviews In 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://cdn.shopify.com/s/files/1/0434/2553/0005/files/jobijinemekozapoboluxe.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/singly_linked_list_program_in_c_with_explanation.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/64754003706.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9462/0333/files/australian_tourist_visa_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/timafatafej/lenojobobuse.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/dibomonitugu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/38048849025.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/barbarians_of_lemuria_legendary.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/ballade_in_g_minor_chopin.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/5009462835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246f3e13-13a8-4b20-a4e1-5c24657b02f4/9060096329.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/029e6cfc-9940-4f06-93f7-4b93c9d893c2/podutigifuvida.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/application_software.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/lapemokevu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65D3 5456 bytes
SHA-256: 876009e465469f41b86a3d9656c9ac6d7f50170451fd68f15a1a744cd7e82f6d
font_01_sfnt_off00007840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7840 10176 bytes
SHA-256: 0a7ea29ef7309c2a975664a5cbceac489ecb57a8d700d9f3bbe87f127a213e0b
font_02_sfnt_off00009ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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