PDF malware analysis — malicious · e3543e2b36fe3605

MALICIOUS

PDF

36.7 KB Created: 2020-08-31 13:42:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dbb8cffe45bd582d57f7595fea42d314 SHA-1: 59dbb96e72166a1868513110b05b0ca7e0d799d6 SHA-256: e3543e2b36fe36052603d40b1b1922d4b1e8a0e257a47476613b6c9f6104eced

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple critical heuristics as malicious, specifically for containing links to known malicious redirector infrastructure and a link farm. The document body contains a URL that points to a malicious redirector, which is likely intended to lead the user to a phishing or malware distribution site. The presence of numerous links to external PDFs hosted on Shopify, while some are confirmed benign, suggests a tactic to obscure the malicious redirector or to appear as a legitimate content aggregator.

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.com/pify?keyword=autenticos+decadentes+tu+forma+de+ser+letra
- https://cdn.shopify.com/s/files/1/0431/4460/9943/files/26977961833.pdf
- https://cdn.shopify.com/s/files/1/0433/0238/7867/files/nupagogugowemenukenu.pdf
- https://cdn.shopify.com/s/files/1/0430/3680/3233/files/48698109853.pdf
- https://cdn.shopify.com/s/files/1/0430/6419/7273/files/ataxia_telangiectasia.pdf
- https://cdn.shopify.com/s/files/1/0433/8017/9109/files/zixutisupezelewinuto.pdf
- https://cdn.shopify.com/s/files/1/0432/4353/6541/files/tazevofadomaj.pdf
- https://static.usrfiles.com/ugd/538d67_6396bffaf04e4c8e914a0edecd93b734.pdf
- https://static.usrfiles.com/ugd/43d598_66ce8b84e02245e184bae1a0d3dfff87.pdf
- https://static.usrfiles.com/ugd/9b7d8a_7d94cbec2a324cb88605fe7833375cb6.pdf
- https://static.usrfiles.com/ugd/44b221_814a334819594b63a04017122382c513.pdf
- https://static.usrfiles.com/ugd/b8c837_7c38f64e06c6438f9b7e65ccef2aafa4.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_off00004e1b.bin` `e85eae728907d28bf0af373ee2866d3637fb14211c6c62904363d926c1d732c6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4E1B	5156 bytes
`font_01_sfnt_off00005f92.bin` `b0d7cf0b57746a58f2c55b058234bafdeb56b5f47f60fd214b85f7e5b32466f1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F92	11268 bytes

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