PDF malware analysis — malicious · c365101f4aca522b

MALICIOUS

PDF

40.1 KB Created: 2020-07-30 20:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 350f3742eddf80f003c76275d1e04f61 SHA-1: a83d21386be75f610e56c1bf815d20bd26be6223 SHA-256: c365101f4aca522b95768428800ec024931701e5d77ba4f22798cf09aa2d97ad

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains a significant number of embedded links, including one pointing to a known malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, likely to obscure the true malicious destination. The presence of multiple Shopify URLs, some confirmed benign and others unknown, suggests an attempt to blend in with legitimate content while distributing malicious links.

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/wb?keyword=azolla%20zs%2032%20pdf
- http://files.bright4seasons.com/uploads/1/3/0/7/130740256/pabekow_juzazovak_jimitotonob_jadalixopalesu.pdf
- http://files.mnmcomber.net/uploads/1/3/0/8/130813144/93d4b.pdf
- http://files.kaetebrittinshaw.com/uploads/1/3/1/3/131383949/05bfcd26783f839.pdf
- http://files.kaetebrittinshaw.com/uploads/1/3/1/3/131383949/05bfcd
- https://cdn.shopify.com/s/files/1/0428/7892/7014/files/xakunaxumotizu.pdf
- https://cdn.shopify.com/s/files/1/0438/3545/7696/files/67492042603.pdf
- https://cdn.shopify.com/s/files/1/0428/3714/7811/files/vusaxulelajep.pdf
- https://cdn.shopify.com/s/files/1/0431/1659/3312/files/1125687405.pdf
- https://cdn.shopify.com/s/files/1/0433/5491/4981/files/44520653537.pdf
- https://cdn.shopify.com/s/files/1/0428/1987/9068/files/danilukitiwegemojak.pdf
- https://cdn.shopify.com/s/files/1/0429/1634/8057/files/wozumokizopuriputoj.pdf
- https://cdn.shopify.com/s/files/1/0430/7540/3929/files/buzoxusujovenume.pdf
- https://cdn.shopify.com/s/files/1/0429/0124/2015/files/denorejetigejalibuk.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_off000057ce.bin` `ba8a4b47dfd9a8f73452ad3fa7fdd927c2dbd778e9530e4c1e80865b3033cb59`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x57CE	4708 bytes
`font_01_sfnt_off000067d9.bin` `5b01eed6e80ab4710b3b91a3c2eff2eda9534e293800d7eaca65c999b09c8fff`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x67D9	13460 bytes

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