PDF malware analysis — malicious · af1453a8cf5c3770

MALICIOUS

PDF

42.6 KB Created: 2020-09-01 03:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: bf23b9a82b69d4679d90d204ea958057 SHA-1: bed98f2211c664905133c9442432bc2248643474 SHA-256: af1453a8cf5c3770ea4924d9fd4740d4e6c6c009367ac5f023b025b5cc9cb735

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.club. The document body, though heavily obfuscated, contains the malicious URL, suggesting the document's primary purpose is to drive traffic to this malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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.club/wix?keyword=chondritic+uniform+reservoir+chur
- https://static.usrfiles.com/ugd/590778_a9c3f49e5ce0402e8df2e2aa17004765.pdf
- https://static.usrfiles.com/ugd/bae363_d7c57d16362840f6a16702a5dbfb0fe1.pdf
- https://static.usrfiles.com/ugd/912de2_2bf6e9c6eef84feaa4592ee3ab41fc88.pdf
- https://cdn.shopify.com/s/files/1/0431/8189/9944/files/assessment_procedure_for_evaluating_a_damaged_structure.pdf
- https://static.usrfiles.com/ugd/97493d_d7381d3bd42c4964bb35f8d16d2912a8.pdf
- https://static.usrfiles.com/ugd/19103d_09682747b158465abafb74e0ab92a2a7.pdf
- https://static.usrfiles.com/ugd/238140_d4766b4e8e754d46b760253b4f7f2f7c.pdf
- https://static.usrfiles.com/ugd/ddb60a_b35fc51a405f4b6b9a6a837713fe69c6.pdf
- https://static.usrfiles.com/ugd/05900a_a23ac9fc69154ff6aca8a7f4132c2edb.pdf
- https://cdn.shopify.com/s/files/1/0434/1497/8718/files/pd_pph3_4.pdf
- https://cdn.shopify.com/s/files/1/0431/5742/2229/files/3559183841.pdf
- https://cdn.shopify.com/s/files/1/0428/3059/4204/files/nibinudaxakusiz.pdf
- https://cdn.shopify.com/s/files/1/0434/0681/9477/files/77467616699.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005b5e.bin` `4bae83f4c672066478d206a58092d6e6251ef85d86d5e1db7c59916e1e6ffc2e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5B5E	4984 bytes
`font_01_sfnt_off00006c2b.bin` `8b4a427ed3f611bcdac74a3aa6e347fc45e22772732890fc70ddce63dcc37b83`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6C2B	10484 bytes
`font_02_sfnt_off00008faa.bin` `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8FAA	4324 bytes

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