Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27339d99589914d…

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 14:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3967002e2a279573852bcf7d42a19bf0 SHA-1: 7f5ca42153c900368c2cd77bff5a99cbdcc56e94 SHA-256: e27339d99589914deb312e3fe1d7d0e2f02c259b556eb4a5c8ba6b08fef679e5
152 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, specifically pointing to 'https://ttraff.cc/wix?keyword=defining+relative+clauses+intermedia'. This indicates the document's primary purpose is to redirect users to a potentially harmful destination. The presence of numerous other PDF links, while many resolve to benign content, suggests a link farm strategy, possibly for SEO manipulation or to obscure the malicious redirector. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the direct user-facing content.

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.cc/wix?keyword=defining+relative+clauses+intermedia
    • https://cdn.shopify.com/s/files/1/0435/7190/4673/files/51934759607.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/cnco_reggaeton_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/temagedipefutuzi.pdf
    • https://static.usrfiles.com/ugd/b8c837_f66acebd9c5a44d2b41c188da780c883.pdf
    • https://static.usrfiles.com/ugd/b8c837_253cc0ff78e042fdb1ed281ec2f3713b.pdf
    • https://static.usrfiles.com/ugd/b8c837_97e2640bd1cb497eaffce27b09671eb0.pdf
    • https://static.usrfiles.com/ugd/b8c837_b71340a52ce44950926d405c7b26cc05.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_f3a029c9b5204850abb35bfb16d6ee06.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee9db509fe3b41b8b98ae1688667e26e.pdf
    • https://static.usrfiles.com/ugd/b8c837_7be0594f904c4eb49244000d054ad660.pdf
    • https://static.usrfiles.com/ugd/3b0c81_9544d8efcc314591a5fdecc8f15fde9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_01c0d35c53b741568e686c0c6e08911c.pdf
    • https://static.usrfiles.com/ugd/b8c837_aea5d194f0d943a1acdbbcd509085e9b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f4fad99df694fcabbcc53da8f491fd4.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_off0000677c.bin
9c3e50a703c9f1c37d7e769074f46da43e539d0de69e706a6b36f85f5c923811
pdf-font-stream PDF embedded font (sfnt) at offset 0x677C 5400 bytes
font_01_sfnt_off000079ce.bin
523030dc0a7ed0049349f960c477fc51b3f47c14c262ae8f01f691519e3f06c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x79CE 9996 bytes