PDF malware analysis — malicious · ddc022692222f88a

MALICIOUS

PDF

42.2 KB Created: 2020-08-29 05:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 3125efc5f6ee9e15adc302dbc5983aca SHA-1: 62e11bf1b5ec33c54a0449fdc482376f7249da7e SHA-256: ddc022692222f88a33d8e7cf8e36dc00785a6bc8889165ec0a950dbac3f4de16

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous embedded URLs, including a primary suspicious URL that appears to be a redirector. The presence of a link farm suggests an attempt to artificially inflate search engine rankings or distribute traffic to malicious 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/wix?keyword=acupuncture+points+pdf+hindi
- https://static.usrfiles.com/ugd/b8c837_388266d1e4a149579eb303dc257b7374.pdf
- https://static.usrfiles.com/ugd/b8c837_83b72741332b4774bce30abf6f9c790c.pdf
- https://static.usrfiles.com/ugd/b8c837_534f01251945428bbf863bea53b52996.pdf
- https://static.usrfiles.com/ugd/b8c837_80d801aaee1948f588f258b845f024c8.pdf
- https://static.usrfiles.com/ugd/b8c837_35ae121b1e99417382783ef8cb8a56e8.pdf
- https://static.usrfiles.com/ugd/b8c837_f94ba408e5774401aeaaa9c15923d862.pdf
- https://static.usrfiles.com/ugd/b8c837_fa4e1d730bb54bb183730743fb3ae968.pdf
- https://static.usrfiles.com/ugd/b8c837_2b8b56e6394a4707b793847a6be78198.pdf
- https://cdn.shopify.com/s/files/1/0436/8059/6121/files/bresser_night_vision_manual.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52876055892.pdf
- https://cdn.shopify.com/s/files/1/0432/4671/5040/files/hostel_movie_trailer.pdf
- https://cdn.shopify.com/s/files/1/0438/2952/6688/files/71698072822.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_off00006826.bin` `ca2231695f90fcdc76dc276edb4ba1eb5d3c857a38af080f185e6f45ff7a20f5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6826	4988 bytes
`font_01_sfnt_off00007914.bin` `35677be9d16a3a3aeded8d52bb5a52fbd3b87a32fad848f41abb4893addb1a54`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7914	10272 bytes

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