Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e2f7bc7adee6fb…

MALICIOUS

PDF

39.0 KB Created: 2020-08-01 20:48:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b42f7cac39b1e53ef338edfa8c41bd9e SHA-1: 7c41260897bff572f2644ada8ffdd4c99471d404 SHA-256: 90e2f7bc7adee6fbd373455799b0602f4c7e5d074dfcad5a9794ea638ae37183
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, https://ttraff.ru/wb?keyword=application.worksheetfunction.vlookup%20vba%20error, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent.

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/wb?keyword=application.worksheetfunction.vlookup%20vba%20error
    • http://files.larnelle.com/uploads/1/3/2/7/132740564/76d9c8173.pdf
    • http://files.circleoffriendsoregon.org/uploads/1/3/1/3/131397973/jabetisenag.pdf
    • http://files.scottkliczewski.com/uploads/1/3/2/8/132814119/repinives.pdf
    • http://files.thel14.com/uploads/1/3/1/8/131856498/wenovuresumixapit.pdf
    • https://cdn.shopify.com/s/files/1/0437/2565/2117/files/longest_palindromic_substring_leetcode.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2452/files/19641090109.pdf
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/89885811487.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6727/files/32268897291.pdf
    • https://cdn.shopify.com/s/files/1/0429/7608/4117/files/python_clear_variables.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/50663575865.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/vimadebubelizobijidazudo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/pabubumezoxaruf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0876/1751/files/dilizusazevipuge.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/53661051865.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/gimap.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_off00005a0e.bin
3b3bc6ede5666e81087c3d5fb2e6f7e61d7776480d4c3b5cb5d697eb91c29890		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A0E 5480 bytes
font_01_sfnt_off00006ccb.bin
f9104ff3ec823588edf6af30ec0e9eedf2e3b983642549fe36f0bfa41f814e7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCB 10056 bytes

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