Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c14b8a19806d5eb…

MALICIOUS

PDF

55.5 KB Created: 2020-08-07 21:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2c8aeac36b0daf3734013f59dea7f47 SHA-1: b95e02ba7ffc7b7aa33f0ad3f9f7abdd05e66e7b SHA-256: 4c14b8a19806d5ebd63d9920547f20e8a5d5f08dcdf113322df1fe0353e25ba2
150 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'analytical balance pdf' and the malicious URL. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via the embedded link.

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=types+of+analytical+balance+pdf
    • http://tivepo.bohemianbluphotography.com/uploads/1/3/1/4/131437812/wuxobax.pdf
    • http://files.broadbandbytes.com/uploads/1/3/2/7/132740281/dakapajivovonik.pdf
    • http://files.monocacycreekhouseconcerts.com/uploads/1/3/0/7/130775304/judivup_mudugokamabu_vukogi_xizokamuneg.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/58955441220.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/bajasugerur.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/lasuzomigeganiwowofuvagid.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/lol_morgana_build.pdf
    • https://cdn.shopify.com/s/files/1/0436/4474/7929/files/tupebojamagiwopazolerudot.pdf
    • https://cdn.shopify.com/s/files/1/0430/5593/9733/files/63331959744.pdf
    • https://cdn.shopify.com/s/files/1/0431/8412/8151/files/24242615471.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5311/files/6414703694.pdf
    • https://cdn.shopify.com/s/files/1/0432/9734/1604/files/walter_isaacson_leonardo_da_vinci_download.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/1/0432/4347/1003/f

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009bc4.bin
7cfc5b0a798ca6e6ccbc5c2074b7a6842d3b478cbde7006e989676ae3541ef86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC4 5244 bytes
font_01_sfnt_off0000adb1.bin
74f2144ec22415306065a55cd1664ff521f5c9261b24a0340e653ea7ac573b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADB1 10376 bytes

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