PDF malware analysis — malicious · f3de1065d11bfa4c

MALICIOUS

PDF

43.8 KB Created: 2020-08-26 22:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 1bcfc09b9996e877a06a36023f327f28 SHA-1: 4ad1416e22752aae373b635a3f8a7e7d429ec726 SHA-256: f3de1065d11bfa4c7aaa5936bdf2e64fe15e66bf1231f60ebb476cb73b15106f

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to other PDFs, a technique often used for SEO manipulation or to distribute malicious content. One of the primary links points to a known malicious redirector. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious link farm.

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=evapco+cooling+tower+selection
- http://files.offroaddemons.com/uploads/1/3/0/7/130776478/43804176e82c.pdf
- http://files.thailandbusinessbrokers.net/uploads/1/3/0/8/130874205/bilowifudixumi_golupufeluxokek.pdf
- https://cdn.shopify.com/s/files/1/0430/3486/9921/files/codedx_user_guide.pdf
- https://cdn.shopify.com/s/files/1/0431/9323/7665/files/72218692767.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xekosipavejidowusa.pdf
- https://cdn.shopify.com/s/files/1/0432/5110/5947/files/58435193217.pdf
- https://cdn.shopify.com/s/files/1/0438/8143/1195/files/bofapokixonavev.pdf
- https://cdn.shopify.com/s/files/1/0437/1995/0485/files/36299160220.pdf
- https://cdn.shopify.com/s/files/1/0432/4923/8178/files/robisunatonaju.pdf
- https://cdn.shopify.com/s/files/1/0462/3263/3495/files/20652133956.pdf
- https://cdn.shopify.com/s/files/1/0432/1257/0787/files/brainstem_function.pdf
- https://cdn.shopify.com/s/files/1/0430/9454/0452/files/41151971976.pdf
- https://cdn.shopify.com/s/files/1/0432/6948/8798/files/add_prefix_dbm.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_off00006cdf.bin` `e7868c0be37d221b364f1c028d88db4d94aa0d9dedc27ace85a12fd26b46fa68`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6CDF	5208 bytes
`font_01_sfnt_off00007ebc.bin` `61f1678580349157daaca2e2bdca9ba710794a8d0df7dd8816aef6a908f0adec`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7EBC	10392 bytes

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