PDF malware analysis — malicious · 91dda312bd6f6fca

MALICIOUS

PDF

42.4 KB Created: 2020-08-29 22:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ba53306ea88c9f821ee186997c4beee5 SHA-1: 702d4e8670e013769837d8e700d8c6842dcc9946 SHA-256: 91dda312bd6f6fca984b0d73fc47d38c4ef4b74c5ad541055749cab05291a126

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=ascp+molecular+biology+study+guide'. This URL is presented within the document body, disguised as a study guide. The file also exhibits characteristics of a link farm, with numerous external PDF links, many of which are benign but serve to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

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=ascp+molecular+biology+study+guide
- https://static.usrfiles.com/ugd/b8c837_496b057afb8d4dd8bef8a6d1c2d62ece.pdf
- https://static.usrfiles.com/ugd/a4e402_8fb039fe04644f4983a91d73bcd981e1.pdf
- https://static.usrfiles.com/ugd/63022f_b0342ebe4a884d12a926ffa2ea8ba136.pdf
- https://static.usrfiles.com/ugd/b8c837_c9560792eea749edb5500466834619e7.pdf
- https://static.usrfiles.com/ugd/0cd3a8_dce1d5cd94d049eeb4b66de7c8aeccc0.pdf
- https://static.usrfiles.com/ugd/b8c837_1d857966b17f415e9e175e82239d8f4d.pdf
- https://static.usrfiles.com/ugd/b8c837_2b933f5f6e99408eb214fd4efcbba7dc.pdf
- https://cdn.shopify.com/s/files/1/0431/8298/1281/files/94371388048.pdf
- https://cdn.shopify.com/s/files/1/0440/7400/8726/files/14979750031.pdf
- https://cdn.shopify.com/s/files/1/0433/4672/2965/files/68153368850.pdf
- https://cdn.shopify.com/s/files/1/0432/3111/7467/files/34338757692.pdf
- https://cdn.shopify.com/s/files/1/0436/0306/7038/files/z_for_zachariah_book.pdf
- https://cdn.shopify.com/s/files/1/0435/5103/1464/files/16400638657.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rapuz.pdf
- https://cdn.shopify.com/s/files/1/0429/6966/1589/files/17437541664.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_off000057c2.bin` `4417133d2171539f66667756c5bedfc07bb0f8673491aa22ad3446880c2fa53f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x57C2	5400 bytes
`font_01_sfnt_off00006a1c.bin` `daf50033f02da57a2f4e63965bdac644720ac7bfe669af570a87af2e6045db3e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A1C	10700 bytes
`font_02_sfnt_off00008e9b.bin` `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8E9B	4324 bytes

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