PDF malware analysis — malicious · 836ab50a648aacdb

MALICIOUS

PDF

35.0 KB Created: 2020-08-29 04:51:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 7c8c64b49744ceb70101c724eaf7a0a3 SHA-1: d8d14943b8f376c35fe88449596d16504313ba4c SHA-256: 836ab50a648aacdb7ac94faf0c9402365bdcf9c32ec38fff13c9126de03cc942

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files, which is indicative of a link farm. One of the primary links, 'https://ttraff.com/wix?keyword=la+greve+des+sapins', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are part of this link farm.

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=la+greve+des+sapins
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0433/5442/3464/files/2636622978.pdf
- https://cdn.shopify.com/s/files/1/0428/9953/8087/files/dalikugixurubuzuganufini.pdf
- https://cdn.shopify.com/s/files/1/0428/5625/1559/files/w9_printable.pdf
- https://static.usrfiles.com/ugd/b8c837_de3c9db0f874497da0122ed0da29be62.pdf
- https://static.usrfiles.com/ugd/b8c837_068917eafbf94b3c9ea576201c468d35.pdf
- https://static.usrfiles.com/ugd/b8c837_580575a57c014bba9314d1ad3098713d.pdf
- https://static.usrfiles.com/ugd/b8c837_bf36f6b73d654dffb9ad9e1c2509dd58.pdf
- https://static.usrfiles.com/ugd/b8c837_b163dd7a12994e479ffc31d4ffef78a0.pdf
- https://static.usrfiles.com/ugd/b8c837_1455d9b0fea344d49ed7ad619d0056bd.pdf
- https://static.usrfiles.com/ugd/b8c837_aeebd7db88c8442e936308865a7e3e88.pdf
- https://static.usrfiles.com/ugd/b8c837_765281d8729b4e3083c224be80ecbd8c.pdf
- https://static.usrfiles.com/ugd/b8c837_16aeaf268ff14bf79ec3240c051505be.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_off0000493f.bin` `2c961f8544097a0d926053c83bf3f55e8912c98988c9e01138eb7f3ce361c88f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x493F	5096 bytes
`font_01_sfnt_off00005aaf.bin` `a29a2fad2bc0e0b295cd65953ce70259705a7b4f41c318af8a67ec83631d546e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5AAF	11164 bytes

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