Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb69ba02041064c…

MALICIOUS

PDF

45.5 KB Created: 2020-08-09 11:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b48d69090bdf5a37020e28c48d7a15a9 SHA-1: e093975cc7eccf4933bc8ed50c97c596b5a8f426 SHA-256: 7eb69ba02041064c25996838fa837c1c013b5f8d463a651b5fac1d60854d0085
162 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to a link farm designed to host other PDFs. One prominent link, 'https://ttraff.ru/pify?keyword=cctv+system+design+proposal+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Cctv system design proposal', suggesting a lure to entice users to click the malicious link. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=cctv+system+design+proposal+pdf
    • http://files.orchardparkhoa.net/uploads/1/3/1/4/131406372/eb4dedc2f.pdf
    • http://files.somersscienceresearch.com/uploads/1/3/1/4/131438419/1859434.pdf
    • http://wikavesug.soxoflove.org/uploads/1/3/0/7/130776131/8480172.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4897/6032/files/34279903152.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/kaxuvidef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17232613021.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nisexabidubukov.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/8679381775.pdf
    • https://cdn.shopify.com/s/files/1/0433/9145/1294/files/18590086330.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1662/files/18996480313.pdf
    • https://cdn.shopify.com/s/files/1/0432/1034/2563/files/92300116349.pdf
    • https://cdn.shopify.com/s/files/1/0435/6662/9032/files/41505073418.pdf
    • https://cdn.shopify.com/s/files/1/0435/8039/1585/files/bazezesepugojezivuro.pdf
    • https://cdn.shopify.com/s/files/1/0434/5312/0664/files/88144021918.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_off00007469.bin
f3c4e5a222f3058ac6ddeb25c7cefaad282333cc73ceb0755bf5e0b1478b5881		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 5540 bytes
font_01_sfnt_off00008738.bin
b25b7becd58f32bcdf7673932ba365b37a9f30a8a53ead40d1ce35ce619e7eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8738 10108 bytes

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