Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb739d82e7bf496…

MALICIOUS

PDF

39.2 KB Created: 2020-09-01 04:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91e1aeec61bb3e374598c870da745c28 SHA-1: a51a96b3f22c2128812322a0a3ea57d28dbdb9df SHA-256: adb739d82e7bf49671664aa224ba4398a7027c8e44e93f5b7c061885d3a2c0d7
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/wix?keyword=multiply+decimals+worksheet+6th+grade'. This URL is embedded within the document's body, disguised as educational material. The file also contains a large number of external links, many pointing to 'static.usrfiles.com', suggesting a link farm or SEO poisoning tactic to increase visibility and drive traffic to the malicious redirector.

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.com/wix?keyword=multiply+decimals+worksheet+6th+grade
    • https://static.usrfiles.com/ugd/9b33c5_93600d8ff220420aaadc267b51c3c833.pdf
    • https://static.usrfiles.com/ugd/f3cb45_ab1825191a7c4e99b1f18d5b535c5d25.pdf
    • https://static.usrfiles.com/ugd/b8c837_e364d45b16e04f329ad911d09b74ddfa.pdf
    • https://static.usrfiles.com/ugd/3649d2_d3446c20dad24430aafd296c091648ca.pdf
    • https://static.usrfiles.com/ugd/270e53_8f90c7c97f0e4b269d904406262c2fc7.pdf
    • https://static.usrfiles.com/ugd/8b49c6_7d63456cf3aa4a1d998e6f992274ae61.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/kawezow.pdf
    • https://cdn.shopify.com/s/files/1/0438/1668/1629/files/carbon_fiber_sheets_blockheads.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_off00005a0b.bin
63e3ecb545564112c1ca84e5bef800fd6f6037e258e2e15c08db33ef5761eef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0B 5904 bytes
font_01_sfnt_off00006e1d.bin
6c2e9e2dfa005ba6f016c8d2f296b35c231153e7e69ef0f8af19f543c2c8d535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1D 10084 bytes

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