PDF malware analysis — malicious · efbf4dc94f03b580

MALICIOUS

PDF

41.7 KB Created: 2020-09-09 21:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0a51cc2129318691e41aedab80fee17f SHA-1: 4594b7df5dfa8ceb8db9912601dd906f98f9caff SHA-256: efbf4dc94f03b58037c3b5e532e8597600fc57b4a0c992232748effce8dd3206

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF document contains a link disguised as a 'cassava farming proposal pdf' which redirects to malicious infrastructure. The ML classifier strongly indicates maliciousness, and the PDF contains a large number of external links, many of which are SEO-optimized, suggesting a link farm or redirection tactic. The primary malicious IOC is the redirector URL.

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.club/wix?keyword=cassava+farming+proposal+pdf
- http://files.hyderabad.bolgate.com/uploads/1/3/0/9/130969381/kojexeruxafawawesa.pdf
- https://static.usrfiles.com/ugd/2e79a6_845509c8b51a4d9f9f6f8abee2f7f2e4.pdf
- https://static.usrfiles.com/ugd/d2057d_5cfe0905aa714a019dc07ec5b14d5992.pdf
- https://static.usrfiles.com/ugd/418e76_ce1c7e780714426a91afc253b008da52.pdf
- https://static.usrfiles.com/ugd/bc79a4_cb0b57ec0dbb423e816f859e607108b8.pdf
- https://static.usrfiles.com/ugd/a48928_4ed417759d2f41828362e2e506be5555.pdf
- https://cdn.shopify.com/s/files/1/0434/5331/7272/files/vedigatatumonozidatupale.pdf
- https://cdn.shopify.com/s/files/1/0432/4173/4307/files/96996461961.pdf
- https://cdn.shopify.com/s/files/1/0437/0395/9720/files/ligne_10_aix_en_bus.pdf
- https://cdn.shopify.com/s/files/1/0435/1868/9434/files/5512898053.pdf
- https://cdn.shopify.com/s/files/1/0429/8961/7311/files/29866548667.pdf
- https://cdn.shopify.com/s/files/1/0430/3080/6679/files/education_board_bd_result_with_marksheet.pdf
- https://cdn.shopify.com/s/files/1/0435/6079/6318/files/luwakanumibulotenedimuwuj.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_off000064ce.bin` `bcdbf2bc5c1700bf9e8f0eec25968d55716f78f910d5b94575455ba1970dafc7`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64CE	5324 bytes
`font_01_sfnt_off000076db.bin` `cb077396eb448fe96b8ed38bb9f6c39c2723d493a30291c52dad5d55d7079034`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x76DB	10316 bytes

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