PDF malware analysis — malicious · 671810d07f293327

MALICIOUS

PDF

40.4 KB Created: 2020-08-31 09:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 2350c33cad007cacdc336fc5171b829c SHA-1: 516706ab2416e12ab08e755b561a2510386f99ba SHA-256: 671810d07f293327c2d7df3b10ae06d3a77e145d348da1f2412b15c6bfe98992

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with the primary link directing to a known malicious redirector. The document body, though obfuscated, contains the title 'Blueprint for negro writing' and the malicious URL, suggesting a lure to a phishing or scam page. The ML classifier also 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.ru/wix?keyword=blueprint+for+negro+writing
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0428/3888/4519/files/xexirajitulolov.pdf
- https://cdn.shopify.com/s/files/1/0450/5973/5704/files/71049738767.pdf
- https://cdn.shopify.com/s/files/1/0427/6633/6167/files/21376456264.pdf
- https://static.usrfiles.com/ugd/b58d21_45611847b49d421eb8698e7ce84390d8.pdf
- https://static.usrfiles.com/ugd/b8c837_9a3ef07e97904202a80aa852f99cc785.pdf
- https://static.usrfiles.com/ugd/b58d21_63f5ce24e8a449babeac774783530b68.pdf
- https://static.usrfiles.com/ugd/097bd5_d0376edfda1041c6a699e64d0dae032e.pdf
- https://static.usrfiles.com/ugd/850f07_41db54fe958442fbb0374587ac9ceb11.pdf
- https://cdn.shopify.com/s/files/1/0433/3630/2750/files/12835554754.pdf
- https://cdn.shopify.com/s/files/1/0438/2582/3904/files/52496747760.pdf
- https://static.usrfiles.com/ugd/b8c837_ba6f6735e8ce48008d1b9f1ed62e32b4.pdf
- https://static.usrfiles.com/ugd/ca300b_fdffc59651504d4fa1293e91ca2ae5f0.pdf
- https://static.usrfiles.com/ugd/b8c837_80cac8eeca774c5aaaac7f0051ac1ef8.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000062ab.bin` `28fdd3a97e56f895c259b56fb1d1c76f320c91f37d0eca4d9ecc2609b7fa77ac`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62AB	4824 bytes
`font_01_sfnt_off0000733e.bin` `7f4fe50b86810513bc02f200d2686258dd9245b3fea2a5ba5027049c47375977`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x733E	9928 bytes

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