PDF malware analysis — malicious · 7c49e44c527597bc

MALICIOUS

PDF

42.6 KB Created: 2020-09-02 09:39:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f9350aec8aca06cf7ab7adeebe755ee6 SHA-1: db52220f7e9b78c160e7cf2cb6a96d8b608a7feb SHA-256: 7c49e44c527597bcc00a28a732937f1a0015254b54d6f6a2fb2c947e72449996

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=counting+to+10+in+spanish+worksheets'. Additionally, it hosts a large number of external PDF links, many pointing to static.usrfiles.com, suggesting a link farm designed to obscure the ultimate destination. The ML classifier strongly supports the malicious nature of this PDF.

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.ru/wix?keyword=counting+to+10+in+spanish+worksheets
- https://static.usrfiles.com/ugd/eaf48f_f52cecda2f2345248694e487d01a884a.pdf
- https://static.usrfiles.com/ugd/762c1a_8d39ddfe2d9e4c5eb35961be4585b48f.pdf
- https://static.usrfiles.com/ugd/ac51ce_f7e9ac7a1c8744a78f8984b8ddc08369.pdf
- https://static.usrfiles.com/ugd/2813e2_ad977f11ddbf4e1ab77f8fb0d4cc3b23.pdf
- https://static.usrfiles.com/ugd/b8c837_f2c2396210724176abdfc9fe94180e7e.pdf
- https://cdn.shopify.com/s/files/1/0464/6620/3806/files/nejibu.pdf
- https://static.usrfiles.com/ugd/cafc24_8a6cdaaed9fd421fbc883e0189f77103.pdf
- https://static.usrfiles.com/ugd/55f640_cd46d6595dba4ce5871cf02b0240e5f1.pdf
- https://static.usrfiles.com/ugd/e02969_2499ef96b70c413abfdbe49ace24d91d.pdf
- https://static.usrfiles.com/ugd/b8c837_810a458af2784d059a46912b4c272261.pdf
- https://static.usrfiles.com/ugd/3d0627_5f7b88296b064e1592cb42f0e4572f85.pdf
- https://static.usrfiles.com/ugd/93c935_00ec894fad99420682f53f598ad2b420.pdf
- https://static.usrfiles.com/ugd/dcf9ad_ccea0b3c797e4e158bac44b84375a801.pdf
- https://static.usrfiles.com/ugd/b8c837_fbecc9a1d58c46e9b45e70e6f34fd5c9.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_off000065d7.bin` `124189ee93deb31ab0737f89c680ca47c8a13e342ada395f0f88394fce461f60`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x65D7	5304 bytes
`font_01_sfnt_off000077f4.bin` `993936a50702eb829e33d89e5bf80e56936cbcb5351b39150cb01fa84c82340e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x77F4	11412 bytes

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