PDF malware analysis — malicious · bc9567b40f7e1615

MALICIOUS

PDF

44.4 KB Created: 2020-08-30 09:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 7f3e2e674f18c3849d8d3e20ab49a837 SHA-1: 676fe6d47b097bdc54071565f154565797184338 SHA-256: bc9567b40f7e16153f2482404549745cef98f1e781192ed3bd558ab8474dc546

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, which points to ttraff.ru. The document body, though heavily obfuscated, contains the same URL and a reference to 'Christmas worksheets for adults', suggesting a lure. The file also contains a large number of embedded links to static.usrfiles.com, indicating a link farm, with the primary redirector link being the most critical IOC.

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.ru/wix?keyword=christmas+worksheets+for+adults
- https://static.usrfiles.com/ugd/b8c837_1db9cf71629548d7b3dc077b23ff0c00.pdf
- https://static.usrfiles.com/ugd/a91264_a80f7f50e83d4a6ab2e5dbc05b14e29f.pdf
- https://static.usrfiles.com/ugd/4bb894_14a858c1cae449b2a9377685ca65f37d.pdf
- https://static.usrfiles.com/ugd/b8c837_7126a32b991b40a094026de72dcea7e8.pdf
- https://static.usrfiles.com/ugd/b8c837_afc8f188e4a548d1bacb7fcad7aeffd4.pdf
- https://static.usrfiles.com/ugd/08fe48_bb4fbd74137345b48443803bc4cb6deb.pdf
- https://static.usrfiles.com/ugd/b8c837_a49289018dd84a7f88afcfbded0bdc9e.pdf
- https://static.usrfiles.com/ugd/73c254_0360f8ba86704552b33909945ff339d2.pdf
- https://static.usrfiles.com/ugd/48d9a1_1bd3e08a5b264c79a76abde8d8b78775.pdf
- https://static.usrfiles.com/ugd/9421c8_bfe7fdb8460447a59af20c469cd3b82c.pdf
- https://static.usrfiles.com/ugd/b8c837_77f9aa36f959444bab99964a89789492.pdf
- https://static.usrfiles.com/ugd/b8c837_fa32e7286ed54b8caacc51df05390803.pdf
- https://static.usrfiles.com/ugd/b8c837_b21fcf4222c04380986aaa691d8e7a95.pdf
- https://static.usrfiles.com/ugd/704566_7abb869921a84ef787963104ff2a86e8.pdf
- https://static.usrfiles.com/ugd/4d400c_d4c2cd06d5a347c582bbdd1b238c819a.pdf
- https://static.usrfiles.com/ugd/ea5d7b_b6b81d49713d41d998e6efef10c2213d.pdf
- https://static.usrfiles.com/ugd/d162e3_70298bb2bb79485fb9cbdf842e87b828.pdf
- https://static.usrfiles.com/ugd/b8c837_6af7c90fc7c6482182a8da4ad1b15588.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00006fdf.bin` `dbbf1ba5551bae191d54a441cd6e94c125ee5832af01801e63198b197147bb90`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FDF	5208 bytes
`font_01_sfnt_off0000817b.bin` `ff2106074f16aba36ade32be250799ce95c803f8609567c18eb10c35ce165372`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x817B	10380 bytes

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