PDF malware analysis — malicious · 8b2bf7b2f97fd1f4

MALICIOUS

PDF

38.7 KB Created: 2020-08-30 12:41:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1891b41a414e3a8aa780fd2bc98bd11f SHA-1: 416eb1c3a69cba6e1597a414c03a15e48fb75528 SHA-256: 8b2bf7b2f97fd1f46a0d94be0c4b75671407f4d8ac04d7563fb5c06dfee203c0

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify and static.usrfiles.com. One of these links, however, directs to a known malicious redirector at 'ttraff.ru'. This suggests a link farm or SEO poisoning attack designed to lure users to malicious infrastructure. No scripts were extracted, and the document body is heavily obfuscated.

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.ru/wix?keyword=wrangler+jeans+fit+guide
- https://cdn.shopify.com/s/files/1/0429/6504/1311/files/sermons_about_the_holy_spirit.pdf
- https://cdn.shopify.com/s/files/1/0428/3862/2375/files/93617259923.pdf
- https://cdn.shopify.com/s/files/1/0430/3601/6802/files/los_nuevos_profesionales_network_marketing.pdf
- https://static.usrfiles.com/ugd/b8c837_84efde7250314dec8f068c642ff89482.pdf
- https://static.usrfiles.com/ugd/003b86_9c92660618c04c228fb95320fd48c5e0.pdf
- https://static.usrfiles.com/ugd/22739b_f3ee010af048401b9445d04c5ddfd995.pdf
- https://static.usrfiles.com/ugd/432b07_e275711d42df4cdb9d2e9a80a8ecb952.pdf
- https://static.usrfiles.com/ugd/934fc3_a040eff5511641968394d5940900665a.pdf
- https://static.usrfiles.com/ugd/c20ea7_45aea682e23143a6848a2b48937fc7b9.pdf
- https://static.usrfiles.com/ugd/3eed2b_5cb9784b5a664a98a418b64650d97eef.pdf
- https://static.usrfiles.com/ugd/b8c837_9b05c253910c4433b5a6a32592893e7e.pdf
- https://static.usrfiles.com/ugd/b8c837_7642f6ffc28645288c5cd434533edc10.pdf
- https://static.usrfiles.com/ugd/8de238_30f894b4296c43579cb5a0fe739e69df.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_off0000530b.bin` `c9ef0ed196b4187ecf6e14593915d77fecbef9ac0c2507a7ab8af07b5e0f8893`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x530B	5164 bytes
`font_01_sfnt_off000064ba.bin` `66d7e7fe193e1c986f01e2b059cfa3527de97e46c354ab49ee8ce2f2bb8ce2a9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64BA	13828 bytes

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