Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b7d5253ca6d6ac2…

MALICIOUS

PDF

46.7 KB Created: 2020-08-21 14:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57a40a2cdde060ab3bbf513530bbcbfe SHA-1: 119de39ef52c89987a343eab1aca2ff5421fdc7e SHA-256: 0b7d5253ca6d6ac2074e95eae47e7ff28619c6e85f660b034440ae6ff4602e9e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, many of which point to potentially malicious or unknown domains, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://ttraff.ru/pify?keyword=livros+auto+estima+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links, suggesting an attempt to drive traffic 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://ttraff.ru/pify?keyword=livros+auto+estima+pdf
    • http://xukojowid.adolfo.club/uploads/1/3/2/7/132710712/wixuxaj-ganidepi-madunawatikeki.pdf
    • http://files.cmspso.com/uploads/1/3/1/1/131164117/litadalowaxenut-sebajabobo-bukomixaj.pdf
    • http://gofodu.readingleaves.net/uploads/1/3/1/3/131398472/b921f7efdd4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0522/2818/files/la_biblia_de_estudio_thompson_en.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/49560969261.pdf
    • https://cdn.shopify.com/s/files/1/0438/4882/7040/files/25854664187.pdf
    • https://cdn.shopify.com/s/files/1/0431/9553/1424/files/12335055966.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/toyota_supplier_quality_assurance_manual_filetype.pdf
    • https://cdn.shopify.com/s/files/1/0428/7247/1718/files/lipazipumomopipegutumilu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/peneti.pdf
    • https://cdn.shopify.com/s/files/1/0433/6166/5192/files/basic_computer_knowledge_questions_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/87463685859.pdf
    • https://cdn.shopify.com/s/files/1/0437/6484/2657/files/36190225047.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e08.bin
ca828bf5b9a4767344dbf0052da3af12f9c6ec6b1769b7225dc25c0864268d54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E08 5156 bytes
font_01_sfnt_off00007f80.bin
eb7635a770d59a2b8fbee1ed0afdc79e1b816ff311cf952ee24b523f04b24be2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F80 2348 bytes
font_02_sfnt_off00008a11.bin
e76405aaffa8b792f9c70aff863f8cf8f5674ee4cfbdc3cf2861bbaf1e05a276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A11 10592 bytes

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