PDF malware analysis — malicious · de237423c3f762fa

MALICIOUS

PDF

40.1 KB Created: 2020-08-20 05:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e43237293367d530848817f045334684 SHA-1: d4de13195bf67094c6f0187f8c8a7e49dc5d46ae SHA-256: de237423c3f762faf77a13ed2b9cc4106d6cb89b987f62a584f639b13a410b7d

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'articles on social media marketing pdf' and embedded URLs, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to redirect users. 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/pify?keyword=articles+on+social+media+marketing+pdf
- http://zabomuv.schgocbkp.org/uploads/1/3/1/3/131379373/f8373b4c78b838.pdf
- http://files.oceanstatebirdclub.org/uploads/1/3/1/8/131856170/genanejelolopagi.pdf
- https://cdn.shopify.com/s/files/1/0438/1959/7981/files/89004632125.pdf
- https://cdn.shopify.com/s/files/1/0432/1142/3902/files/44375931973.pdf
- https://cdn.shopify.com/s/files/1/0432/8384/1190/files/vivopezejerugibawalir.pdf
- https://cdn.shopify.com/s/files/1/0432/2358/0831/files/21869307723.pdf
- https://cdn.shopify.com/s/files/1/0433/7886/8387/files/cetosis_bovina_fisiopatologia.pdf
- https://cdn.shopify.com/s/files/1/0428/6418/1404/files/86727602308.pdf
- https://cdn.shopify.com/s/files/1/0437/0422/1849/files/rimexitojopewisazikid.pdf
- https://cdn.shopify.com/s/files/1/0437/6811/9445/files/koliledilolut.pdf
- https://cdn.shopify.com/s/files/1/0438/5597/0454/files/1290585889.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_off00005d91.bin` `c8bd5f1bd1d9f92b6db3ea51b6a99223b6c93240a909b0a28c5245a7142e68f6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D91	5528 bytes
`font_01_sfnt_off00007046.bin` `5822669c8d506fdb98f8e51f7c10bf1df8886afe628ae74c55b7ed3ab060abf6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7046	10392 bytes

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