Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a0bbf797b2a949…

MALICIOUS

PDF

39.2 KB Created: 2020-09-02 00:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05340a1a8fd3d5ad8e52d9a6d8dc8e08 SHA-1: 692f6321f48c90f4873a722d9bda16eca06e87e0 SHA-256: f5a0bbf797b2a949d7a67ce013ed196f2d51b590e2ab55a14f27ad56b4fbe011
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used for SEO poisoning or to direct users to malicious sites. One of the primary links, 'https://ttraff.ru/wix?keyword=gaja+cyclone+video', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure related to a 'Gaja cyclone video'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=gaja+cyclone+video
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/difugamejezex.pdf
    • https://cdn.shopify.com/s/files/1/0433/5540/6494/files/jufopobajivagotadapab.pdf
    • https://cdn.shopify.com/s/files/1/0438/3503/1712/files/phonics_lesson_plans_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3304/files/niboxevujalebu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/34647733678.pdf
    • https://cdn.shopify.com/s/files/1/0431/0020/9319/files/does_chiari_malformation_cause_nausea.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/86815758416.pdf
    • https://static.usrfiles.com/ugd/b8c837_11f7ecd756004282906389a3974d8e0e.pdf
    • https://static.usrfiles.com/ugd/e3c460_d0d5d238c4f446f395d556c10d4368c2.pdf
    • https://static.usrfiles.com/ugd/43d598_aa72df1f1c0a410d95ab71c6119ab4e9.pdf
    • https://static.usrfiles.com/ugd/07e02c_26ee056ef1914b3c80b9e93d7aee7730.pdf
    • https://static.usrfiles.com/ugd/24deb6_1acc029c195e40e5aca37aa4c00a8640.pdf
    • https://static.usrfiles.com/ugd/6812d7_360feaf9e14840b4971267fa52536e40.pdf
    • https://static.usrfiles.com/ugd/0f5b72_5010526021c14a84b1a32ac5e34ccc9e.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_off00005e42.bin
170eee52631dbc821676f85b22b04485b75a64e227bd9da55011ec9225bcb152		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E42 4928 bytes
font_01_sfnt_off00006f2f.bin
baadbcd93ecbdd73c5790cd38e6b91e6b5739c85bd45535403449c22d27bdb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F2F 9684 bytes

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