Malicious PDF — malware analysis report

Static analysis result for SHA-256 c19db663b895c986…

MALICIOUS

PDF

47.9 KB Created: 2020-08-30 12:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a86207b39e4075eb7b864640be22949e SHA-1: 0f86665c7566055154d2badffef4f338ebb05190 SHA-256: c19db663b895c986c0184e28b7f75f9a8299047a850fbe741291019a3a352576
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=familial+hypercholesterolemia+screen'. This URL is designed to lure users into clicking it, likely leading to further malicious content or exploits. The document body, though heavily obfuscated, also contains this URL and a list of other PDF links, suggesting a link farm or redirection strategy. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=familial+hypercholesterolemia+screen
    • https://static.usrfiles.com/ugd/de65f7_26fd95a5320d4a9fb9c7eeb7ea994176.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3432394b27c49f6849e96a7c898cee8.pdf
    • https://static.usrfiles.com/ugd/b8c837_e57810900aa64e4c94ebf406672e2a70.pdf
    • https://static.usrfiles.com/ugd/b8c837_070088fb37e64e268fdf9a8b0129cb64.pdf
    • https://cdn.shopify.com/s/files/1/0433/9315/5237/files/1844128518.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/fabilosubegenabozuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8642/9861/files/52843914749.pdf
    • https://cdn.shopify.com/s/files/1/0429/6985/8214/files/blank_page_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/1718/2104/files/mevuwigelimabevomelububa.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4506f7c46214facacc6fc0c8b826402.pdf
    • https://static.usrfiles.com/ugd/158fb9_3ed5a5cc813740f9a7d8fac1e029dc4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a163b0170c94cfbb48ce232486b0802.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed2e180409194f98bff96c534e57243b.pdf
    • https://static.usrfiles.com/ugd/87a178_9088a49680b543ad8a45a9e6e1ebe80f.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_off00006f08.bin
8de6435605a380eb3fde99266c6333057e28038aaaef430d7a8b812d73c70547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F08 5228 bytes
font_01_sfnt_off000080ae.bin
d5e3a274a987ed32d94078562f3015d481bc7a1d200683020a624d8e9454393e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80AE 15352 bytes

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