PDF malware analysis — malicious · 28d561d09f9db478

MALICIOUS

PDF

37.1 KB Created: 2020-08-29 12:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ee53d15402a58fea37c47e7a53ebde4b SHA-1: 60240883b28d4d8cfd88afff5d58d1649a659cf0 SHA-256: 28d561d09f9db478860393159860fbd4e3c5a47fe7a267058689dbe6dd292627

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded document body, though heavily obfuscated, contains a URL that matches the redirector link. This suggests the document is designed to lure users to a malicious site, likely for further exploitation or phishing. No scripts were extracted from this sample.

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=cambridge+grammar+of+english+cd
- https://static.usrfiles.com/ugd/b8c837_be66833404b94fb0b528e06dfa17749b.pdf
- https://static.usrfiles.com/ugd/b8c837_d4e60a866d5641c7a107ae86a43722e5.pdf
- https://static.usrfiles.com/ugd/b8c837_08eeb43d05254791a498f9333ada8f1e.pdf
- https://static.usrfiles.com/ugd/b8c837_133699766a68417d99bdd95685438f55.pdf
- https://static.usrfiles.com/ugd/b8c837_d8d64489f40d4aec932370a7b2cd48c1.pdf
- https://cdn.shopify.com/s/files/1/0431/7511/6961/files/dupomevojazilela.pdf
- https://cdn.shopify.com/s/files/1/0438/2231/7725/files/thyristor_principle_of_operation.pdf
- https://cdn.shopify.com/s/files/1/0435/8694/5181/files/45447383982.pdf
- https://cdn.shopify.com/s/files/1/0431/0433/8073/files/theory_of_symbolic_interactionism.pdf
- https://cdn.shopify.com/s/files/1/0428/1411/1903/files/rent_to_own_contract_template_california.pdf
- https://cdn.shopify.com/s/files/1/0432/0185/5646/files/pabogabinunepebij.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000465f.bin` `0f4a8bb6643a5d0179f4b7feaf285eb962ef5858c469e34977bb55ab059dec70`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x465F	5308 bytes
`font_01_sfnt_off00005833.bin` `9cf904e115f51cae7680e1ab05394d5943e09fbffc93e17d1979e1fb9c35fc95`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5833	9780 bytes
`font_02_sfnt_off000079ad.bin` `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x79AD	4324 bytes

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