Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb51c116bea14e1d…

MALICIOUS

PDF

40.4 KB Created: 2020-09-01 04:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52c84265d7bb5e9e4f2d82679e4298b7 SHA-1: 80515c333f76c00a862e8de4fa52077c5de59373 SHA-256: eb51c116bea14e1de21603f2015cff0a90747c26a6283587f3c9b6dfee7e424d
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=verbal+ability+and+reading+comprehension+book+pdf'. This indicates the document's primary purpose is to redirect users to a malicious site. The document body, though heavily corrupted, contains fragments of the redirector URL, reinforcing this finding. The presence of numerous other PDF links, while some are benign, suggests a link farm or SEO poisoning tactic to distribute the malicious lure.

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.link/wix?keyword=verbal+ability+and+reading+comprehension+book+pdf
    • https://static.usrfiles.com/ugd/c1615c_82fe7e23c001469e895644e3da6cc664.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b2801f4ef954e06afde1a49b0f6e3d3.pdf
    • https://static.usrfiles.com/ugd/fe83c3_fcf8a6be1a6d430eaa3a14a5c72c19ca.pdf
    • https://cdn.shopify.com/s/files/1/0457/3918/0188/files/proposal_a_mediator_novella.pdf
    • https://static.usrfiles.com/ugd/a31856_d06fbd287218440ab7734606a98dc234.pdf
    • https://static.usrfiles.com/ugd/b50c55_1f544eadbc7345a3bc54ce101337a1ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_c2958a0c1b7747b9ba6ba69f770e05f5.pdf
    • https://static.usrfiles.com/ugd/b8c837_96f1f79f01ab40d9b0803742480f2cd7.pdf
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/1013696188.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/77214252917.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.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_off00005d67.bin
23c3adf590873d3845187ea29650f9ea6a3dbdbb3325cc43e35e9b0ef7afdd31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D67 5840 bytes
font_01_sfnt_off00007127.bin
ae043f06208a943ca8bc4d51c265a9fdf8eb62f35a484e5d7059d0e9eca4b60c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7127 10596 bytes

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