PDF malware analysis — malicious · 93f3fb6e3da41c8a

MALICIOUS

PDF

70.7 KB Created: 2020-08-06 20:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b521fe4ed09f886b6cd9944b1859191a SHA-1: b8eee3f4009cdd7a90e336ec0b87d499d8aa29b1 SHA-256: 93f3fb6e3da41c8a0c7a9fe31688d0881fed4abf1195773b574e72ccbc70e400

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm for SEO manipulation or to obscure malicious redirects. One critical heuristic firing indicates a direct link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=barrera+hematoencefalica+histologia+pdf'. The document body, though heavily corrupted, contains this same URL and a reference to 'wkhtmltopdf', indicating it was likely generated by a tool for creating PDFs from web content.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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=barrera+hematoencefalica+histologia+pdf
- http://files.addictionrecoverymovement.com/uploads/1/3/1/4/131437878/bavizaruwavukasodowi.pdf
- http://files.danielakfineart.com/uploads/1/3/0/7/130738548/6191127.pdf
- http://files.atelei.com/uploads/1/3/1/3/131398059/51e168e389130.pdf
- http://files.mysciddoc.com/uploads/1/3/2/6/132681343/3534375.pdf
- http://files.reneeleaberger.com/uploads/1/3/1/4/131408854/kaduzomap-lenipavururu-giwuvugegen-zebavurix.pdf
- https://cdn.shopify.com/s/files/1/0432/7555/0876/files/87782069867.pdf
- https://cdn.shopify.com/s/files/1/0435/6187/7665/files/galaziwidugaw.pdf
- https://cdn.shopify.com/s/files/1/0429/8565/2375/files/85852706664.pdf
- https://cdn.shopify.com/s/files/1/0429/6769/5511/files/52595649025.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
- https://cdn.shopify.com/s/files/1/0433/9718/5701/files/logitech_remote_software.pdf
- https://cdn.shopify.com/s/files/1/0435/2134/3647/files/lenemanuzurel.pdf
- https://cdn.shopify.com/s/files/1/0427/4031/8375/files/kepurezepuxuvuvemod.pdf
- https://cdn.shopify.com/s/files/1/0431/8344/0030/files/pimedirebififugatupuxa.pdf
- https://cdn.shopify.com/s/files/1/0435/3146/8951/files/essential_biochemistry_3rd_edition.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_off0000d55f.bin` `0b0088338ef026636fce1488701566f75b8bce75081d251916fef63169fe0b7d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD55F	5616 bytes
`font_01_sfnt_off0000e851.bin` `8b6c9196ea89fb269c7def413bde9da8e4a383372a66b9421e408daa2e041d48`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE851	10948 bytes

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