PDF malware analysis — malicious · 55862f21e408a9f3

MALICIOUS

PDF

47.1 KB Created: 2020-09-01 06:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 210ec77f2489e5c8373f63c2c94b9fbe SHA-1: cddfb14b093dd538d4adb2a940e85a3c68fab686 SHA-256: 55862f21e408a9f334ed9113cfdb686811774df47e85a7f2d37f4981c7eb33f1

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as medical guidelines. The document also features a large number of external PDF links, many hosted on static.usrfiles.com, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 4

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.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
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.com/wix?keyword=bronchitis+guidelines+idsa
- https://static.usrfiles.com/ugd/314c35_fd00204259144e1fbe5253ae28c1f231.pdf
- https://static.usrfiles.com/ugd/0dcf4b_9839b313b1d4459cb67569532b64153a.pdf
- https://static.usrfiles.com/ugd/b58d21_4b496f537b9e4a4e9cee0f7315485f94.pdf
- https://static.usrfiles.com/ugd/b8c837_a89861ec2d0148a5bc7c1a34fe376d43.pdf
- https://static.usrfiles.com/ugd/b8c837_e14af3858e1a4c8395955d88307a7e7a.pdf
- https://cdn.shopify.com/s/files/1/0435/3271/4139/files/jatevagileniwigexeke.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdf
- https://cdn.shopify.com/s/files/1/0435/8062/0963/files/doguporabaxadubijurelu.pdf
- https://static.usrfiles.com/ugd/fd3290_be283ecbb3944fbf95ebc0f5a1b63d2f.pdf
- https://static.usrfiles.com/ugd/1c90dc_da27151ccb9c47938c7461806b5560b6.pdf
- https://cdn.shopify.com/s/files/1/0432/6146/0644/files/toefl_itp_sample_test.pdf
- https://cdn.shopify.com/s/files/1/0431/3271/5163/files/98183330362.pdf
- https://cdn.shopify.com/s/files/1/0431/5322/7932/files/burning_glass_kathryn_purdie_pdf.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_off00006ea1.bin` `1e7bad51afd57fc4e7b68939f9a777367e17c30bfec32759c4c24dacec2ce6b0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6EA1	5252 bytes
`font_01_sfnt_off00008074.bin` `7f22b9d86c78599e53551bf3c01db6ed825017e11b3525c952e3bd2ce3c373b0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8074	15488 bytes

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