Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2a48e7cbfaef54…

MALICIOUS

PDF

44.9 KB Created: 2020-09-02 17:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a5dfca69f0a241e2e8cea312df36f6f SHA-1: 6232446f442c54995df7ac59ef5e5ae5e6734f77 SHA-256: cb2a48e7cbfaef54eccbce66ba671a4cf886052d4a8793a8a87c596eeb4dbcf9
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=crohn%2527+s+disease+guidelines+2015'. It also contains a PDF link farm heuristic, with numerous links to PDFs hosted on static.usrfiles.com. The document body, though heavily obfuscated, contains the redirector URL, suggesting a lure to external malicious content.

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=crohn%2527+s+disease+guidelines+2015
    • https://static.usrfiles.com/ugd/0a052f_4d200a4cfcaa4430ac068934f9224dd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_14e3c7e9331d406da9326c96fd478f5d.pdf
    • https://static.usrfiles.com/ugd/682d1c_d927c3b1708043b193afa6a6f629be9c.pdf
    • https://static.usrfiles.com/ugd/d54300_9f404186dab440c8a7ac2b7eeda2d2d8.pdf
    • https://static.usrfiles.com/ugd/ea2f88_49a213a15e104b06bf726dee62195812.pdf
    • https://static.usrfiles.com/ugd/a467d2_ed5a56abc1de4329b97f101956aefc65.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/rimamowuposidaxofexapikaw.pdf
    • https://cdn.shopify.com/s/files/1/0446/3765/1107/files/lds_primary_song_gethsemane_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dedijadexurusefux.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/63079892435.pdf
    • https://cdn.shopify.com/s/files/1/0428/8767/6063/files/devoir_maison_maths_4C3A8me_corrigC3A9.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_off00007208.bin
38c0a909448f8bf1e0c3dce5c056f19aebad70d1f4369bcfdde32b11d5d38971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7208 5476 bytes
font_01_sfnt_off000084a9.bin
1f86956c5722fb65d02a6fa3d1c4f64ac2dfad048f32be3e5fc6558d5dfd84f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A9 9952 bytes

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