Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7542a6558b71e4c…

MALICIOUS

PDF

32.9 KB Created: 2020-08-28 15:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b8b9ed3ae6f54c73ae23c47368c651f SHA-1: 7226247bda65ef2c48fa802c8f559f6d79197f3b SHA-256: b7542a6558b71e4c9ae885d8b220bb545fa338d9b53e8d071787269a1ff6171d
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, with one specifically identified as a malicious redirector. The heuristic firings indicate this is a PDF link farm, likely designed for SEO manipulation or to distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=tripkolic+g%25C3%25B6zlerinin+ye%25C5%259Filini+%25C3%25B6zledim
    • http://files.torontopostponed.com/uploads/1/3/0/8/130813859/medosemaluxa.pdf
    • http://files.ginotorres.com/uploads/1/3/2/6/132695663/towijudisisonab.pdf
    • http://files.cookiesthenmilk.com/uploads/1/3/0/7/130776757/f9d1d9583f.pdf
    • http://files.theellarosegallery.com/uploads/1/3/0/8/130814298/41d700db4a47.pdf
    • http://dowov.amandagretschot.com/uploads/1/3/0/7/130739845/5896801.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/fanuwefizuzurije.pdf
    • https://cdn.shopify.com/s/files/1/0436/2718/4281/files/juruzipudiwejenavorixe.pdf
    • https://cdn.shopify.com/s/files/1/0457/4422/6460/files/83747055757.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/fundamental_of_structural_analysis_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8172/files/18244904241.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/sopuzexarezonupuxib.pdf
    • https://cdn.shopify.com/s/files/1/0436/0021/6232/files/devomujatejixawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2000/1178/files/xosamuwemusolome.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/adding_decimals_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/naratajojakuvo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/75286852903.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_off00004534.bin
29f8717cf87a5f0570d62e448a688b4c344501c3322667b0a7cd585b28dd17c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4534 5556 bytes
font_01_sfnt_off000057ca.bin
c85eb2c537c97ea1475ee68f827d96118fdba479f7259e5925aa5164302f91a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CA 9020 bytes

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