Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a42170d75a3c09b…

MALICIOUS

PDF

43.8 KB Created: 2020-08-29 16:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c9032d3d4d13af3cf4595d11edc543f SHA-1: fa57935b4de441ec4fa59bf4e3c14a74694c3a6b SHA-256: 7a42170d75a3c09bb311c4bc73c6236840c9b4906e55c83c7f3d064733746e89
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, including one to cdn.shopify.com. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to lure the user to a compromised site.

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=francisco+callejo+magaz
    • https://cdn.shopify.com/s/files/1/0433/4436/3678/files/dafaroreloketunirekamof.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/48292633905.pdf
    • https://cdn.shopify.com/s/files/1/0436/9544/0040/files/invitation_cards_for_christmas_party_templates.pdf
    • https://cdn.shopify.com/s/files/1/0433/9951/2231/files/65878740815.pdf
    • https://static.usrfiles.com/ugd/b8c837_319dcc4883274e6bb420b8e9bea3a978.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2f5b7c97fa74059a3227169a7126296.pdf
    • https://static.usrfiles.com/ugd/b8c837_114f6fa836b74e938d7a4e247ad61e08.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4960a152b724b51b4f3158374e3ba99.pdf
    • https://static.usrfiles.com/ugd/3f80ec_925553640e104357ac60473d543f2314.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc899b1769d7402da12a96490a872b75.pdf
    • https://static.usrfiles.com/ugd/b8c837_3cbaa84d9d7345cf81a4212289ed7854.pdf
    • https://static.usrfiles.com/ugd/b56239_3f21223e02574772a93431e8188e5185.pdf
    • https://static.usrfiles.com/ugd/b8c837_e32663d164b94940a19c6eeb3fa24506.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_off00006684.bin
55b4d75162228a0ede57d4d1cdb02f47251ef82a9647a2836701753a0edfb7f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 5200 bytes
font_01_sfnt_off00007822.bin
70ebf47d8cd6c88b3d1589bb5ef103c2b0b83e7b0429e9ce69d4760b52ac2437
pdf-font-stream PDF embedded font (sfnt) at offset 0x7822 13312 bytes