PDF malware analysis — malicious · f3c91ecd9c0db994

MALICIOUS

PDF

68.8 KB Created: 2020-08-22 16:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 237badea9b567b4fb4195d8b64512310 SHA-1: 65d540dbd116754b945fef0cde27511c0d22e1e4 SHA-256: f3c91ecd9c0db994d8a1ab1894e90d66d52877889385538cc9cf0fb8d7977761

154 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a malicious redirector link disguised as a worksheet, intended to lure the user to a malicious site. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be generated by wkhtmltopdf, a common tool for creating PDFs from web content, suggesting the PDF itself was likely generated to host the malicious link.

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/pify?keyword=coping+with+grief+worksheets
- http://files.jessiehodges.com/uploads/1/3/0/7/130776386/worimub.pdf
- http://www.ther
- https://cdn.shopify.com/s/files/1/0432/6676/9051/files/71055243285.pdf
- https://cdn.shopify.com/s/files/1/0429/9587/5989/files/23136619315.pdf
- https://cdn.shopify.com/s/files/1/0431/1013/8017/files/20039459634.pdf
- https://cdn.shopify.com/s/files/1/0430/7343/7847/files/powiwixanerubibu.pdf
- https://cdn.shopify.com/s/files/1/0434/5567/6583/files/37872450763.pdf
- https://cdn.shopify.com/s/files/1/0432/9691/5621/files/42635029880.pdf
- https://cdn.shopify.com/s/files/1/0431/6227/1898/files/35527027630.pdf
- https://cdn.shopify.com/s/files/1/0432/0142/9662/files/76045722112.pdf
- https://cdn.shopify.com/s/files/1/0433/8457/0019/files/fabururirogiz.pdf
- https://cdn.shopify.com/s/files/1/0432/9160/7190/files/13809233620.pdf
- https://cdn.shopify.com/s/files/1/0433/0822/0574/files/rijutidapiziladojag.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_off0000d109.bin` `88395fc4938fbe78cf8bbcb9e0d3eb240e26cfcf8c47edd010ef87709d5281ec`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD109	4980 bytes
`font_01_sfnt_off0000e210.bin` `9dd7d8ec7f4ee7a2766d83c8d50f3ab20c856528c4c6dbb3035bd4d13b3ac501`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE210	10568 bytes

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