PDF malware analysis — malicious · a1c03efe5043916d

MALICIOUS

PDF

42.6 KB Created: 2020-08-30 12:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 8545a1966a43770fae94034f2833e44a SHA-1: 54a84acae9aa10ea7c56dd8378f9af16ec987358 SHA-256: a1c03efe5043916d2f43df54619480c4002bc8476ab457ee607a4523a5738aaa

120 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=rewrite+sentences+exercises+advanced'. This URL is presented within the document body, disguised as an advanced sentence rewriting exercise. The PDF also contains a large number of external links, many of which point to 'static.usrfiles.com', suggesting a link farm or SEO manipulation tactic. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a malicious site or download further malware.

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=rewrite+sentences+exercises+advanced
- https://static.usrfiles.com/ugd/5bb01c_06d496357a844c93891771b0936c5ebe.pdf
- https://static.usrfiles.com/ugd/b8c837_2514bf244c0642bd965e8c4b80d22643.pdf
- https://static.usrfiles.com/ugd/4b874d_8c598f69d51d49e9b1ce4f09227feee0.pdf
- https://static.usrfiles.com/ugd/c5d40f_a1cfd089f63f4d95abf47f07b07e83be.pdf
- https://static.usrfiles.com/ugd/80c1db_8fbd47989b224feebd74624ca5c5ea65.pdf
- https://cdn.shopify.com/s/files/1/0438/2906/7938/files/pumipepokolele.pdf
- https://cdn.shopify.com/s/files/1/0432/3262/4797/files/folamukizuduxe.pdf
- https://cdn.shopify.com/s/files/1/0439/8910/6846/files/pininilunupelor.pdf
- https://cdn.shopify.com/s/files/1/0433/6327/0815/files/growing_geometric_patterns_worksheet.pdf
- https://cdn.shopify.com/s/files/1/0430/5544/8213/files/carcinogenic_substances.pdf
- https://static.usrfiles.com/ugd/a298ce_dec47d683af146899898d8b75e56e6cc.pdf
- https://static.usrfiles.com/ugd/b8c837_beba4432736d44e8bebca1d18845bce3.pdf
- https://static.usrfiles.com/ugd/2f07a1_a2f5d996a1c144cd96536124b5d24b3d.pdf
- https://static.usrfiles.com/ugd/b8c837_ac947309aaed413a945ce7c4bb124e90.pdf
- https://static.usrfiles.com/ugd/7d21c0_96e3e5fb2848444a9857441f7da9f36a.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005d40.bin` `8207cc363b6f72c72fbc4258d7acc15ab88012e041599247411b6cf0831510e6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D40	4804 bytes
`font_01_sfnt_off00006db1.bin` `31fd81258c53989f8bf28f6ebfd803a4c000944323146b61b7c066ba23b46ff0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6DB1	9828 bytes
`font_02_sfnt_off00008f47.bin` `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8F47	4324 bytes

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