PDF malware analysis — malicious · 5bd85c15acbb7887

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 07:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: a7455cb12b14cc8537cc9f751ef8e1f1 SHA-1: c9afe9d77e526e8c2de1635545067f00f6539d45 SHA-256: 5bd85c15acbb7887926126e4a325ff15c971c994159fcf70f6c79cd8907a3b86

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to known malicious infrastructure, disguised with a seemingly innocuous keyword. The ML classifier strongly indicated maliciousness, and the presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic to distribute malicious content. The primary IOC is the redirector URL used in the lure.

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=monopoly+instructions+uk+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/cb4a18_42eac5473640484cb0115c6aa14ef7a2.pdf
- https://static.usrfiles.com/ugd/74a852_de68c7e3bc5c479d8cc6db44438480d0.pdf
- https://static.usrfiles.com/ugd/b8c837_2dba0c823b7a41fc9f1d03463ff52488.pdf
- https://static.usrfiles.com/ugd/4c1554_176b2d4d97f543879a103ef5370280c8.pdf
- https://static.usrfiles.com/ugd/b8c837_9c0e9fdcae2349c7a7723f529029c282.pdf
- https://static.usrfiles.com/ugd/b8c837_5bf50ae1afd24b6fb38718fd7279e402.pdf
- https://static.usrfiles.com/ugd/b8c837_f726de9f536747beb94008c7e6e6d8bd.pdf
- https://static.usrfiles.com/ugd/b8c837_1d5a2dd33e8f4870ade6ce14afcca3b6.pdf
- https://static.usrfiles.com/ugd/7f46b5_0519191e9ea047c7a44e06329a56ad90.pdf
- https://cdn.shopify.com/s/files/1/0437/0166/5960/files/download_acrobat_reader_to_edit.pdf
- https://cdn.shopify.com/s/files/1/0431/6856/3355/files/78818754530.pdf
- https://cdn.shopify.com/s/files/1/0430/6848/9881/files/46957937413.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006425.bin` `6f1012bc00238c3c92301149237a1f4ac06e6762a880b34f1d3051ddfad3c89b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6425	5108 bytes
`font_01_sfnt_off000075a6.bin` `f2b3e6d8144b7701d09034ed07f3d03f18246862a43046d771541bd73b8885a1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x75A6	12012 bytes

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