Malicious PDF — malware analysis report

Static analysis result for SHA-256 f687f0779cd8063e…

MALICIOUS

PDF

36.8 KB Created: 2020-08-31 04:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4384c6dfd62a32704500f0420181b3b SHA-1: 4754029b98d58466e46bbcebd25a73297f7faaff SHA-256: f687f0779cd8063e85ed139df70a48a854302134a273dd55ab43576cae13f7e5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of these links, 'https://ttraff.cc/wix?keyword=www+learning+extension+com', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=www+learning+extension+com
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/nezoroxunevovagovoviwejol.pdf
    • https://cdn.shopify.com/s/files/1/0434/0128/1701/files/ropovawegajubiwuna.pdf
    • https://cdn.shopify.com/s/files/1/0439/0292/7003/files/consumer_reports_identity_theft_protection_companies.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/101_american_english_idioms.pdf
    • https://static.usrfiles.com/ugd/455f95_37e72e8fa3da460c8c772ec2711113c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_1c0b1f739eb242aa9231e83263d6eb70.pdf
    • https://static.usrfiles.com/ugd/cbe7f7_e9b87050ed5a4b55b8c83fb7b5fa52ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_a89861ec2d0148a5bc7c1a34fe376d43.pdf
    • https://cdn.shopify.com/s/files/1/0436/5022/0185/files/ruwumikixipejesexulug.pdf
    • https://cdn.shopify.com/s/files/1/0428/4186/6403/files/fall_out_boy_immortals.pdf
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/walebitotum.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0701/files/8859986738.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/social_identity_theory_definition.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.

FilenameKindSourceSize
font_00_sfnt_off00004ff1.bin
92d6e6c01361524794115aabcf98e74f304a9bf6fb5586f020847a204f4e22d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF1 5292 bytes
font_01_sfnt_off000061f7.bin
e5da6cea1d5c4ee21c4304b4936995190de64662904aafe6d856222f8a1d6526		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F7 10244 bytes

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