PDF malware analysis — malicious · b923e046951725eb

MALICIOUS

PDF

37.7 KB Created: 2020-08-29 04:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: fdf02d572359f954c82d2cf5be4be33f SHA-1: 444373a409c20a088581920ab2f5f567cf793004 SHA-256: b923e046951725eb08f08f48ba956491e1cd18ccfc9fdaf67356bbaa1a95c402

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and appears to contain the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=holding+hands+meme+template
- https://cdn.shopify.com/s/files/1/0427/5005/0460/files/18561826115.pdf
- https://cdn.shopify.com/s/files/1/0432/5736/4638/files/mn_merit_system.pdf
- https://cdn.shopify.com/s/files/1/0449/9508/4452/files/rental_lease_agreement_form.pdf
- https://cdn.shopify.com/s/files/1/0427/6705/7063/files/pdf_split_merge_ubuntu.pdf
- https://static.usrfiles.com/ugd/b8c837_1f5032cacb614a659fbf97637db76a98.pdf
- https://static.usrfiles.com/ugd/b8c837_84aa15f310db454fb859f21775e70940.pdf
- https://cdn.shopify.com/s/files/1/0430/4093/1991/files/rukizug.pdf
- https://cdn.shopify.com/s/files/1/0438/1245/4557/files/mewuzelavatevileladujem.pdf
- https://cdn.shopify.com/s/files/1/0431/2976/6039/files/dinixasojurosumedeniw.pdf
- https://static.usrfiles.com/ugd/b8c837_72d4d373bbd24959b2e36528554b99ea.pdf
- https://static.usrfiles.com/ugd/b8c837_a586055689a44ff191ed48523f317cce.pdf
- https://static.usrfiles.com/ugd/b8c837_4319f67e1db144a1a62b5839a94f623e.pdf
- https://static.usrfiles.com/ugd/b8c837_7eaebefef42b4d12b2474f6936f870e8.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_off000053ee.bin` `162a4cd76122d234224486678d0747af06447088ec2bc3838d3df9ce9f94d8be`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x53EE	5240 bytes
`font_01_sfnt_off00006592.bin` `c7f955d67f1e8c9d5bcd32303d46eba184b5fbfb92091e010e18646bdfcbc06e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6592	10900 bytes

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