PDF malware analysis — malicious · b39543bc83856d63

MALICIOUS

PDF

39.7 KB Created: 2020-08-30 18:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ce42f4badbd0012b1e9866f4cf40703a SHA-1: de6dedfe1cba14d637029d1ee0736e505a42fa7f SHA-256: b39543bc83856d632103cedda50561954f9f3be3a62fe5b89313d7a8dbebc364

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/wix?keyword=ejercicios+de+proyecciones+axonometricas'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and several benign-looking PDF links, suggesting a lure to a malicious 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.cc/wix?keyword=ejercicios+de+proyecciones+axonometricas
- https://cdn.shopify.com/s/files/1/0434/6531/0374/files/xatexaji.pdf
- https://cdn.shopify.com/s/files/1/0439/0833/3736/files/88714932833.pdf
- https://cdn.shopify.com/s/files/1/0436/4523/9456/files/junumuxaxadefidutubamo.pdf
- https://static.usrfiles.com/ugd/d1c05f_9a5281dcf132491eb8de96f40dadd569.pdf
- https://static.usrfiles.com/ugd/4d400c_e3f1c5c2bfe344bcadeffae900a30e0d.pdf
- https://static.usrfiles.com/ugd/8de238_2cb7dc03476a4798b99b866ebe8e8151.pdf
- https://cdn.shopify.com/s/files/1/0431/2452/3169/files/jogepoxikikanomosofum.pdf
- https://cdn.shopify.com/s/files/1/0431/4827/9957/files/64535177251.pdf
- https://cdn.shopify.com/s/files/1/0428/5703/7990/files/kejizupusoluto.pdf
- https://cdn.shopify.com/s/files/1/0440/7577/8198/files/btc_first_semester_science.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/
- https://cdn.shopify.com/s/files/1/0431/4827/9

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005baf.bin` `153ee4f2aa41639480c65353c55038a01e6b4bef4af0d5dd63e31228eebc6636`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BAF	5392 bytes
`font_01_sfnt_off00006df8.bin` `c327b7dc64550c9633d8b6ef2a9b060785d28ef32d77c9ed3a695b7af9af26c8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6DF8	10376 bytes

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