PDF malware analysis — malicious · 7af34310249c1451

MALICIOUS

PDF

39.1 KB Created: 2020-07-26 12:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: f9a8bc4961245f3c55b5c3053696c2ee SHA-1: e0f917240536d85aaa28141c71208838ae9e41ac SHA-256: 7af34310249c1451f94ea2a16b9048e5ea5e3f158dd3eae71ee1e8c4bf0bd577

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a mass external PDF link farm, with multiple links pointing to shopify domains and one critical link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious infrastructure under the guise of a quiz.

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.cc/pify?keyword=coordinating+conjunction+quiz+pdf
- http://files.horshamtreesurgeons.co.uk/uploads/1/3/1/1/131163890/165eeadab28c.pdf
- http://files.nightheronfarm.com/uploads/1/3/2/6/132695200/e6dd614c03e115.pdf
- http://files.blackbunnyboutique.com/uploads/1/3/1/6/131606480/xuzovasozosi.pdf
- https://cdn.shopify.com/s/files/1/0432/7384/6952/files/soxurutoxagejosoroxufix.pdf
- https://cdn.shopify.com/s/files/1/0430/8808/5145/files/79700915285.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
- https://cdn.shopify.com/s/files/1/0435/4339/6506/files/1907397820.pdf
- https://cdn.shopify.com/s/files/1/0431/5093/4173/files/lubemaner.pdf
- https://cdn.shopify.com/s/files/1/0432/6552/3862/files/88531733072.pdf
- https://cdn.shopify.com/s/files/1/0428/8859/3571/files/39014204866.pdf
- https://cdn.shopify.com/s/files/1/0440/9376/7832/files/86560202196.pdf
- https://cdn.shopify.com/s/files/1/0434/0632/7959/files/58229823666.pdf
- https://cdn.shopify.com/s/files/1/0432/1820/6888/files/nazelusibuvebadi.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/
- https://cdn.shopify.com/s/files/1/0431/5093/4173/files/lu

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005bff.bin` `1fe93c3ff45e1725a1b42b27f6c8a36f0527296e81006aadf5fa2719144ef419`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BFF	5152 bytes
`font_01_sfnt_off00006d9a.bin` `37bc7338f12747fc096c4b86302f2e5dafe8cc954ef7e10a3e1f9fdf58d15586`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D9A	9956 bytes

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