Malicious PDF — malware analysis report

Static analysis result for SHA-256 a204b8ff9790ebaf…

MALICIOUS

PDF

53.8 KB Created: 2020-09-01 07:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2a0aa57347907a7dbd925bcef1aa9dc SHA-1: 5ca4cc1d0cadb8ab98f1ba303cb6a7c85b1a0ed2 SHA-256: a204b8ff9790ebaf3904d627793dff1acf915706932fc13ee29ef87c63fa5593
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 pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same redirector URL and several benign-looking URLs, suggesting a lure to a malicious site. The ML classifier 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.com/pify?keyword=general+guidelines+for+conducting+research+interviews+mcnamara
    • https://static.usrfiles.com/ugd/b8c837_65e1bab8a22148e0a2ac25efb02edf60.pdf
    • https://static.usrfiles.com/ugd/934fc3_d79b34e1a5184879b31b7384458466dd.pdf
    • https://static.usrfiles.com/ugd/7603ae_d8d1880c07f1491b8d7950cea18d701c.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_e687d709bc9a434a9246366df1b10c12.pdf
    • https://static.usrfiles.com/ugd/08fe48_73d698569b7343d9b66169a0308c6e55.pdf
    • https://static.usrfiles.com/ugd/33ab24_889ead4c5cc84fc496621f94023d78a1.pdf
    • https://static.usrfiles.com/ugd/3826db_ab000aa4cb2f4370a77053cdfa6095fe.pdf
    • https://static.usrfiles.com/ugd/ecec20_072a22068dcc4385ad9f084cd613f4c9.pdf
    • https://static.usrfiles.com/ugd/6cf392_123e3b1168a94b75a82183285631bc67.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/a_b_simpson_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6918/files/analytical_chemistry_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0436/9586/6010/files/zijejuxomepitabibamewowud.pdf
    • https://cdn.shopify.com/s/files/1/0432/2276/1635/files/69803597615.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/gelovobovajodojos.pdf
    • https://static.usrfiles.com/ugd/b8c837_c074f97ce5614b67994cb249c05d89f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_baf03b0f78af4595a2ef86900b87d4ac.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_6f22702e6f6645c9ab85670d01e4bb3c.pdf
    • https://static.usrfiles.com/ugd/a107db_1e192747e8574087a5715fe4258e3fc3.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_off00009403.bin
06357bd1d70375904224d44acd27fabdcb49d41fdfe56e4499c2fdf8c6609a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9403 5620 bytes
font_01_sfnt_off0000a708.bin
1f9e0ad9f1f9836584874feafce44c06e06f0a3fff8d32389286649343121e0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA708 10240 bytes

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