Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf3f908b4b0f4cb…

MALICIOUS

PDF

63.4 KB Created: 2020-08-21 12:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8298edcf256989d7cd0c3ae620587f8 SHA-1: 271c5dc8519a5cec6245176fe350dfe2d9cca502 SHA-256: bbf3f908b4b0f4cb941e3026f3dc627985a1b5b84aba3b55a26e3feaae76460f
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a reference to 'nc freshwater fish identification guide' and the malicious URL, suggesting a lure. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the malicious nature of the redirector.

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/pify?keyword=nc+freshwater+fish+identification+guide
    • http://files.blackoaktherapy.com/uploads/1/3/1/4/131437161/6042991.pdf
    • http://goxudag.parchmentstudio.com/uploads/1/3/1/4/131437987/8caf899.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/lazebukikefikemafodufotak.pdf
    • https://cdn.shopify.com/s/files/1/0437/4803/2666/files/27462307263.pdf
    • https://cdn.shopify.com/s/files/1/0433/3810/5000/files/62895815587.pdf
    • https://cdn.shopify.com/s/files/1/0430/6577/0133/files/zezejujizakij.pdf
    • https://cdn.shopify.com/s/files/1/0428/7548/6367/files/tevukazen.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/66594681122.pdf
    • https://cdn.shopify.com/s/files/1/0440/7744/9366/files/38616659667.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9397/files/anti_intellectualism_in_american_life.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5885/files/gagiragojuwilapidim.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/mivibotemusigurawojunu.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/
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/lazebukikefikemafodu

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b352.bin
5a7a4504e41420013a6403224bf771984a306dcb98376522b8797ecd459e6c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB352 5312 bytes
font_01_sfnt_off0000c56f.bin
59283867bbffa3eacda4e60869c363d57d574110f2304f0039aa93e5fcf5dbb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC56F 13464 bytes

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