PDF malware analysis — malicious · f89ad1d3554dd351

MALICIOUS

PDF

39.5 KB Created: 2020-08-30 12:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ead8bab019ce373790323df61caf9adf SHA-1: defc0f7e6289ac085a7320a2c16e2e83bc9e247f SHA-256: f89ad1d3554dd3519f79a91eff95af7977ba9259f99b70b5afea3b274193ed2e

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. One of these URLs, 'https://ttraff.ru/wix?keyword=rotate+furniture+stardew+valley', is identified as a known malicious redirector. The document body is heavily obfuscated and appears to contain junk data, but the embedded URL is clearly visible. The primary attack pattern involves luring users to malicious sites via these 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.ru/wix?keyword=rotate+furniture+stardew+valley
- https://static.usrfiles.com/ugd/b8c837_6449315d0e44409598dd7ff201f59c26.pdf
- https://static.usrfiles.com/ugd/de65f7_cd039819d1434586a26dcf91c78ebe8d.pdf
- https://static.usrfiles.com/ugd/2e16aa_017887fa5ab348c9ab351cc1641c62ea.pdf
- https://static.usrfiles.com/ugd/cac9e4_86ad2fcbd2cc4eada43de80480178838.pdf
- https://static.usrfiles.com/ugd/e5a943_cd67f418fde943f09b1cda458cfe074d.pdf
- https://static.usrfiles.com/ugd/cac9e4_7ace09ea88794448b7cdd3f543ee00c3.pdf
- https://static.usrfiles.com/ugd/b8c837_2b20d45d18b94ade923c547aeb79234d.pdf
- https://static.usrfiles.com/ugd/b85eb0_d14eec137f304490b66fd34fcc86eedf.pdf
- https://static.usrfiles.com/ugd/b8c837_9076aaec9c194d188f25b10af038e4df.pdf
- https://static.usrfiles.com/ugd/e2c6c1_39cbe30e72d04d3080d743265b65a016.pdf
- https://static.usrfiles.com/ugd/30e015_272bfbbcc57d4ab1bf4ce0dc1b306ec3.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_off00005d15.bin` `a4afae73c6089b27066bec4ef2498e588083f9b709ed924363ba4b73775ea2cb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5D15	5160 bytes
`font_01_sfnt_off00006ed3.bin` `fdf27ee9451bdb766ffbc5338b4244d5841bff2cf02f10ef0d7124ef57d26e43`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6ED3	10184 bytes

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