PDF malware analysis — malicious · 2edad3606ab63d02

MALICIOUS

PDF

38.7 KB Created: 2020-08-30 03:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: eb629c4f9be840159c48d1e4dafd383f SHA-1: e476200f78d89b1b5c913c8fab5eeb9c61dda342 SHA-256: 2edad3606ab63d020c7102743aee87c61c630f73cfa97a1d52e485bed53cc579

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it's an 'employee confirmation letter', a common lure. The PDF also hosts a link farm pointing to numerous other PDFs, likely for SEO poisoning or to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=employee+confirmation+letter+malaysia
- https://cdn.shopify.com/s/files/1/0432/2508/8168/files/mevalif.pdf
- https://cdn.shopify.com/s/files/1/0433/4111/9653/files/cauchy_schwarz_inequality_theorem.pdf
- https://cdn.shopify.com/s/files/1/0434/6816/1184/files/41978086671.pdf
- https://cdn.shopify.com/s/files/1/0435/3120/6808/files/linefoneradutarozap.pdf
- https://cdn.shopify.com/s/files/1/0435/4208/5783/files/98295454195.pdf
- https://static.usrfiles.com/ugd/d54300_07aea694ddc84fb7afafc305c4f2e49d.pdf
- https://cdn.shopify.com/s/files/1/0435/6059/9701/files/nelinuvopesowewe.pdf
- https://cdn.shopify.com/s/files/1/0429/2139/4343/files/nc_driver_s_handbook.pdf
- https://cdn.shopify.com/s/files/1/0428/0690/2950/files/19449036274.pdf
- https://cdn.shopify.com/s/files/1/0466/5635/6517/files/31700399082.pdf
- https://cdn.shopify.com/s/files/1/0431/2567/0037/files/jizedobogoxizo.pdf
- https://cdn.shopify.com/s/files/1/0462/2771/8293/files/ruxogogimupis.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_off000059eb.bin` `f321e70d5dc9672354f31f70c7bba27d3a3399bf70450277286995d57f3b0ef0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x59EB	5220 bytes
`font_01_sfnt_off00006b9f.bin` `a333f0e77abc63e01463f7fb572db5a36dfd3c447e2e43a1624fbd160fc34868`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6B9F	10068 bytes

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