Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3138021004ebdab…

MALICIOUS

PDF

41.1 KB Created: 2020-08-06 23:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c24fb5fe646743e216cffed0b506839f SHA-1: 2acc51a9078d2fa60c28e6bc992c65f2e5cb06f8 SHA-256: f3138021004ebdab10c68f8427471b01699f9cbf96c47d1b70fc86011016af7b
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to '2020 calendar printable pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, reinforcing the assessment that it is designed to redirect users to harmful content.

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.ru/pify?keyword=2020+calendar+printable+pdf
    • http://files.attheranch.org/uploads/1/3/2/7/132740277/vufikevedin-dirulamopafixoj.pdf
    • http://milukunew.flawlessskinstudio.com/uploads/1/3/2/6/132681947/lurujolizilafem.pdf
    • http://files.foxydrummer.com/uploads/1/3/1/4/131407369/6212519.pdf
    • http://files.coonafit.com/uploads/1/3/0/8/130874035/fd316916e62.pdf
    • https://cdn.shopify.com/s/files/1/0436/5929/6926/files/sqlite_complete_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/46897623422.pdf
    • https://cdn.shopify.com/s/files/1/0431/1790/4039/files/nuzivivobuxipaveravotu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5670/0319/files/phenolic_compounds_in_plants.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/nunokasisilimibupow.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/zogivojumageperomelurezeb.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1288/files/gogudekena.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/webifevawe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0891/7657/files/tofilagelo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8004/7010/files/nizorot.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_off00006377.bin
d658a4710c688a447123378ad62570133dd689b50c99f7d5b275295e094d9a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6377 5288 bytes
font_01_sfnt_off00007572.bin
765402cf58ba2e6cd304d94f9c7c59fc8c9dc35ec291c7e5c5f7a781d46deb6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7572 10080 bytes

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