PDF malware analysis — malicious · 1d3723250e190566

MALICIOUS

PDF

40.9 KB Created: 2020-08-19 21:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 0bebb6df777de8703f5e2413c16c2bec SHA-1: 53e0179f25938db84d7a386ec931de6aebaa2656 SHA-256: 1d3723250e190566275ca93d9392bc7ef22199add4776430e85204cfcc05bc85

152 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains a link farm with numerous embedded URLs, including a critical finding of a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and other links, suggesting a coordinated effort to lure users to potentially harmful sites.

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/pify?keyword=indesign+resume+template+2018+free
- http://loxusi.starcitydarts.com/uploads/1/3/2/8/132815002/mosap.pdf
- http://files.shadowbrk.com/uploads/1/3/1/0/131071277/mokibi.pdf
- https://cdn.shopify.com/s/files/1/0434/1547/0245/files/streptococcus_agalactiae_en_orina.pdf
- https://cdn.shopify.com/s/files/1/0429/6163/3439/files/business_office_manager_job_description.pdf
- https://cdn.shopify.com/s/files/1/0436/4409/2566/files/711580271.pdf
- https://cdn.shopify.com/s/files/1/0436/4750/0448/files/64677966604.pdf
- https://cdn.shopify.com/s/files/1/0434/4204/5090/files/vutisawodi.pdf
- https://cdn.shopify.com/s/files/1/0431/0908/9447/files/puregesaluvovedoferebaxuw.pdf
- https://cdn.shopify.com/s/files/1/0428/5943/0054/files/dolopoxikezomidi.pdf
- https://cdn.shopify.com/s/files/1/0438/2516/8544/files/pipojo.pdf
- https://cdn.shopify.com/s/files/1/0432/3206/7739/files/rosutelaru.pdf
- https://cdn.shopify.com/s/files/1/0430/2438/4154/files/mexedekikav.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_off00006011.bin` `e8868318ee5df494728e50cc2ea1eb7062b67ed542344dbceeea2205663c3839`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6011	5816 bytes
`font_01_sfnt_off000073be.bin` `5ad5a706f18580b0ac3d419febb7a5f641d3433155d2b3568bc42e84cf188aa0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x73BE	10344 bytes

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