PDF malware analysis — malicious · 4ad2319cc112c446

MALICIOUS

PDF

37.6 KB Created: 2020-08-31 11:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 9dd75b886daa668fdd4ba0f099e40287 SHA-1: 269e2febb56c1eaad3d7140f302f4599fdaeff41 SHA-256: 4ad2319cc112c44660855905eeb1b599e67fb203aa780746ef13beaf6965f8ff

150 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, pointing to 'https://ttraff.cc/wix?keyword=quotient+rule+derivatives+worksheet'. The document body, though heavily obfuscated, appears to contain text related to a worksheet and the malicious URL. The presence of numerous external PDF links, many hosted on static.usrfiles.com, suggests a link farm used for SEO poisoning or to obscure the final destination. The primary attack pattern involves luring the user to click the malicious link.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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=quotient+rule+derivatives+worksheet
- https://static.usrfiles.com/ugd/b65acf_ec3b45c9e62d4adfb4f483ff8afee88f.pdf
- https://static.usrfiles.com/ugd/eb6612_7513c9c8e384436b8b608a1702ef4f58.pdf
- https://static.usrfiles.com/ugd/aff7ca_9f0dd64977484c449f322fec55b2c6af.pdf
- https://static.usrfiles.com/ugd/2f8cea_8278012f9d5642579c3e5cd9bf7ae315.pdf
- https://static.usrfiles.com/ugd/b8c837_265a730817ca492ea2ea61f626ffaf0f.pdf
- https://cdn.shopify.com/s/files/1/0435/4726/3128/files/nenader.pdf
- https://cdn.shopify.com/s/files/1/0435/6934/8763/files/52843269288.pdf
- https://cdn.shopify.com/s/files/1/0431/2003/3943/files/pretul_nesocotintei_mary_balogh_download.pdf
- https://cdn.shopify.com/s/files/1/0434/2877/4044/files/army_ground_sheet_singapore.pdf
- https://static.usrfiles.com/ugd/c1108c_7ec76627699a4bcf9c255faacd895382.pdf
- https://static.usrfiles.com/ugd/b8c837_4655a326cd484d3082b8df47b7d8b63f.pdf
- https://static.usrfiles.com/ugd/ec0c41_e860e70eb6d74e5bb87987d7873724ec.pdf
- https://static.usrfiles.com/ugd/c7a620_978f6863afc5466392e7197832ce1b22.pdf
- https://static.usrfiles.com/ugd/1fa6dd_aa4d6576bc674334af56afb8e132108b.pdf
- https://static.usrfiles.com/ugd/b8c837_d5a5e16b484240afa9dc71198d5e6b73.pdf
- https://static.usrfiles.com/ugd/b8c837_d43c93516a0849f0b9d79c0f08777172.pdf
- https://static.usrfiles.com/ugd/b8c837_4a10ce090e854ed3947ec2c181d10032.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_off00005163.bin` `4212c7e422056d37f99ba70d626832ddf6a2892e0fc68bd035a57efee06a2709`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5163	5188 bytes
`font_01_sfnt_off00006313.bin` `bc091380cbbe59a9e8cb6e224c89ef11ad7f488fefe93ab7b907fc28bc152da3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6313	12036 bytes

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