Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae63731f7956670…

MALICIOUS

PDF

38.3 KB Created: 2020-08-31 07:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 921b7b11f4538d70b6c05f2c5cafaa72 SHA-1: 348d5bced50816545ae897bd07a92a3ff647bcee SHA-256: 0ae63731f7956670c3ab4d50305419fa7a11d6a399322edc64e2e654e7211ce8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged as malicious due to a high number of embedded links, many pointing to external PDF files, suggesting a link farm or content hosting strategy. One URL, https://ttraff.ru/wix?keyword=abuelita+de+batman+slang, is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious redirector URL and several benign-looking PDF links.

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=abuelita+de+batman+slang
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/10b11f_f5dca93505c444a9866f0d451c26600d.pdf
    • https://static.usrfiles.com/ugd/b8c837_65b630379da3491ab4784af37e4b5ad0.pdf
    • https://static.usrfiles.com/ugd/5ed537_4731627f9142483da600d07d1758fc33.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_3fd38be7f1a743589d87bd120fea3bf2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1af16ffb28e6454c916cbb9a6fc20157.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8e06fc5fe7142e8833420b4b276a4ec.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_3c83f3875baf414ca761c7f04dc3a6a0.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3020/files/dozud.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/capital_markets_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6587/6379/files/mozojowuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/fipadedigigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1321/files/wivipudejowiragijixenop.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_off00004b85.bin
d8a24700be9484755c4a7431b184e483b86c7123674bf18b501c90c100d89c02
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B85 4948 bytes
font_01_sfnt_off00005c34.bin
770bfa3ee93b20a5360c3d2e7796efbd739bdb0b2cea5339d7eec2b95c340e9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C34 10060 bytes
font_02_sfnt_off00007eb5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB5 4324 bytes