Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fea25723dbc2991…

MALICIOUS

PDF

43.7 KB Created: 2020-08-03 16:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11a097ff09e8a312670c0c7ffded690c SHA-1: c69331bf6b28a251abe11e75bba617acd7a6bbd0 SHA-256: 6fea25723dbc2991a8f683382079aa86350322b1e4ce0bd41deec231fa01e7ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and contains a large number of external links, many pointing to other PDF files. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=concepto+de+auditoria+administrativa+segun+autores+pdf', is associated with known malicious redirector infrastructure. The document body itself is heavily obfuscated and appears to be generated content, likely intended to mask the true purpose of the link farm.

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=concepto+de+auditoria+administrativa+segun+autores+pdf
    • http://files.durringtontheatricalsociety.com/uploads/1/3/1/1/131163838/fc61992b142.pdf
    • http://files.thethirtyfirst.org/uploads/1/3/2/3/132302978/fujuxowurabufurigag.pdf
    • http://files.siliconvalleycoders.org/uploads/1/3/0/7/130738641/d4ce4d181c4.pdf
    • http://files.amorajstudios.com/uploads/1/3/0/7/130739069/viwak-tikowex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2454/5949/files/kokefigofisajukaralosid.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/nawinep.pdf
    • https://cdn.shopify.com/s/files/1/0435/8173/5073/files/58293991413.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3350/files/degamineb.pdf
    • https://cdn.shopify.com/s/files/1/0431/4746/0768/files/vulitunajolitorir.pdf
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/topopometudopobizosu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3893/3146/files/xuzizakewivij.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/4582704034.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/leliturugilej.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/lozafibe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0880/3495/files/pukipeji.pdf
    • https://cdn.shopify.com/s/files/1/0432/8338/2427/files/66043507089.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_off00006789.bin
f756f2f74e771b079943c25c4c3c470c479c724ffc4216b77a371d75227dfa36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6789 5408 bytes
font_01_sfnt_off000079e3.bin
fefea8fb838a1b2239d6308dee282adc79a80970cfff17d2379b5c31d5c4db98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E3 11620 bytes

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