Malicious PDF — malware analysis report

Static analysis result for SHA-256 136ee6b5c296dae7…

MALICIOUS

PDF

50.0 KB Created: 2020-08-29 02:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0db9c34cff5875bec8ec6c23cdee668a SHA-1: e0ec80061e29d6042a0c71496ef4bf857a195641 SHA-256: 136ee6b5c296dae730cd1c96600f8cdd165acd8814a2d12fb8a103fa725afe5a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files, a technique often used for SEO poisoning or to host phishing content. One prominent link, 'https://ttraff.ru/wix?keyword=la+mal-aimee+1995+download', is flagged as a malicious redirector. 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://ttraff.ru/wix?keyword=la+mal-aimee+1995+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/tominurugidefude.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7566/files/xenavurebolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/buderenigodinin.pdf
    • https://static.usrfiles.com/ugd/b8c837_54aff90327a942fe8d998f90f4cc31ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_fd8ad63ecae84ffc85b9a3f23ffe319e.pdf
    • https://static.usrfiles.com/ugd/b8c837_3e8da7c8c22a446daf85dfdd6e88f652.pdf
    • https://static.usrfiles.com/ugd/b8c837_f2f8ee6dcc2042408a592ecaf12b1995.pdf
    • https://static.usrfiles.com/ugd/b8c837_63f5b5e8bde64ac286054fa631610ed4.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/57149978441.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/xenapetewutunigu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1522/files/79257906067.pdf
    • https://static.usrfiles.com/ugd/b8c837_022ee43f2371415abf797dadcf72075d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3b2b1b066dc141a9bbc45e3bdc29363e.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006412.bin
45a28f5a1f75310310b577312337fda37652b59142fefe357e87f312113a0a50
pdf-font-stream PDF embedded font (sfnt) at offset 0x6412 5092 bytes
font_01_sfnt_off00007578.bin
38494ce22697bc7893da33c60b5b68eb3ff164116609f2333885e7f896e74a74
pdf-font-stream PDF embedded font (sfnt) at offset 0x7578 15340 bytes
font_02_sfnt_off0000a52b.bin
f60b7b8eb238cadd40949fd04ec51347752b8fe49ffe87bbea8dbadae972049e
pdf-font-stream PDF embedded font (sfnt) at offset 0xA52B 16552 bytes