Malicious PDF — malware analysis report

Static analysis result for SHA-256 743ea280e6470c79…

MALICIOUS

PDF

39.9 KB Created: 2020-08-30 07:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f117f17a22feec3b00b0124440d5862 SHA-1: e9c0745076d91bc62aaf8feece40b2b8180cbe93 SHA-256: 743ea280e6470c79ffc2df9d252bbad82b320c7cd03e62829e2b30b6e1927caf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The primary URL, 'https://ttraff.ru/wix?keyword=evaluation+6eme+division+euclidienne', is flagged as malicious. The document body, though heavily obfuscated, contains this URL and other links to PDF files, suggesting a link farm or redirection scheme designed to lead users to malicious content.

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/wix?keyword=evaluation+6eme+division+euclidienne
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/karoluxabed.pdf
    • https://cdn.shopify.com/s/files/1/0463/0331/4080/files/name_the_oceans_of_the_world_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/9415/4146/files/7595429870.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/92073767922.pdf
    • https://cdn.shopify.com/s/files/1/0437/7945/7175/files/lefabusugovetejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0247/files/vutar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0575/files/acme_thread_standard.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4496/files/assessment_for_learning_tools.pdf
    • https://static.usrfiles.com/ugd/29c71c_9d7279e60191465db4430a7d9800fa9e.pdf
    • https://static.usrfiles.com/ugd/b8c837_b230c4e6b47f4f22a88feba991eb1ddd.pdf
    • https://static.usrfiles.com/ugd/ea78e0_dd74aee7bde744e4853c9cb80ce113b5.pdf
    • https://static.usrfiles.com/ugd/4d6844_3ba794e723fa4b14b773c5cd21f3e5e1.pdf
    • https://static.usrfiles.com/ugd/b8c837_12eb73f1113a465d906497cf408704f6.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c58.bin
00a5dbe37fcf47599b8a0ec2005e3f07559dd97a18cd6a50a5d1c8517466fbc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C58 5160 bytes
font_01_sfnt_off00006dda.bin
c10cdf2ff709737381c841f380b6ca6b2a2dee9c4490102c418c265ab0b444f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDA 10968 bytes