Malicious PDF — malware analysis report

Static analysis result for SHA-256 f374e8645123c46b…

MALICIOUS

PDF

38.6 KB Created: 2020-09-12 02:53:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e992360590bfe3892bcbe1e93515b4da SHA-1: ca1aaab9e9351f626b130d5a4c129d914363aae4 SHA-256: f374e8645123c46b30392292998bf11c8c44c4cda5b0121861d1ccd9db932715
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=rational+expressions+worksheet%2523+8'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on shopify.com, suggesting a link farm or SEO poisoning attempt. The primary malicious URL is likely intended to redirect the user to a malicious site, possibly for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.club/wix?keyword=rational+expressions+worksheet%2523+8
    • http://files.skullcatstudiosshoponline.com/uploads/1/3/0/8/130873728/4110508.pdf
    • https://cdn.shopify.com/s/files/1/0435/3975/9259/files/45151301080.pdf
    • https://cdn.shopify.com/s/files/1/0435/7632/8355/files/85435881890.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3487/files/60972347851.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3779/files/28604014891.pdf
    • https://cdn.shopify.com/s/files/1/0434/5679/0681/files/runa_vimochana_angaraka_stotram_in_telugu_download.pdf
    • https://static.usrfiles.com/ugd/67f5f7_bd3d30526c244ff3adcbfd44f47e761d.pdf
    • https://static.usrfiles.com/ugd/80bfa9_cb33d460ffdb44059d7212cb78fb6d0f.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_off00005883.bin
f1d336e02a1cf08758533f6968b57c07ef7eee1874bb751f5b0bfc1653e68635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5883 5136 bytes
font_01_sfnt_off00006a0d.bin
7e2652b345d69c8b5e908d0c0b360ebbcb01a1811064c46a5a5e95203395925b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A0D 10640 bytes

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