Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cb9f5ca460409a…

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 02:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3340941f92ad187b7012c50b1535e177 SHA-1: bc02e085ae2b7a4a6b23872406567903f4cbd83b SHA-256: 94cb9f5ca460409a04c5f6f544e44a37dbe908c74adeca27166039b4f71e8170
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=ati+radeon+hd+5870+driver'. This URL is presented within the document body, disguised as a driver download. The presence of a large number of external PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly flagged this PDF as malicious.

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=ati+radeon+hd+5870+driver
    • https://static.usrfiles.com/ugd/b8c837_0f59dcc6f09e496f9b992b449d9a0371.pdf
    • https://static.usrfiles.com/ugd/b8c837_114f64670ca74bfea1e12801b3e01b00.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_c7bdb269def94a5a95181cfa84c35793.pdf
    • https://static.usrfiles.com/ugd/e5a943_77b2e587704949d5bf1c7f92ee06ec46.pdf
    • https://static.usrfiles.com/ugd/52b593_6a4cca08f49a4362b6e7261cc1651c03.pdf
    • https://static.usrfiles.com/ugd/d55797_8feda27476324afebec7cc60ef029832.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e116894d6184ac1bfd4b3303e2beaed.pdf
    • https://cdn.shopify.com/s/files/1/0430/9388/5089/files/boogiepop_and_others.pdf
    • https://cdn.shopify.com/s/files/1/0433/5743/8101/files/32234029650.pdf
    • https://cdn.shopify.com/s/files/1/0437/0386/1416/files/nasaruk.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/vekedizivozedugigaputaf.pdf
    • https://cdn.shopify.com/s/files/1/0448/1007/6322/files/amityville_o_despertar_hd.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/monakafipegejukotam.pdf
    • https://cdn.shopify.com/s/files/1/0438/9106/4987/files/23857579429.pdf
    • https://cdn.shopify.com/s/files/1/0429/3266/6524/files/13410742142.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cc5.bin
9bbf07b2ba75513cc5629677f6daf8f70da578fd6af45de31e9d44297208bd1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CC5 5292 bytes
font_01_sfnt_off00006ecb.bin
eba2abcdc8983bdffca90204939e6510aa1006290e2f6263fbd4f2976e009272
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ECB 15232 bytes