Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f89a423b65c9c8…

MALICIOUS

PDF

43.8 KB Created: 2020-08-17 07:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e62d86538ec3180ac093b8a86ab4aea4 SHA-1: b811f435dae590ab02dbe01562a9649938a3885a SHA-256: e6f89a423b65c9c8de5f2818c7b097c7a190d1d9e589c7210647912e77e3ad5a
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=collocation+information+in+marathi, is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=collocation+information+in+marathi
    • http://files.kimjones.org/uploads/1/3/0/7/130775221/1984811.pdf
    • http://xuvuxit.inglesespecializado.com/uploads/1/3/1/3/131380600/gituwodazivaj.pdf
    • http://watigok.stsrx.com/uploads/1/3/2/6/132682646/doganoxuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/python_multiple_inheritance.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/44906885508.pdf
    • https://cdn.shopify.com/s/files/1/0432/5552/9640/files/22683481440.pdf
    • https://cdn.shopify.com/s/files/1/0428/5667/7543/files/analyse_mathmatique_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1402562920.pdf
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/36331635936.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/93867881616.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7645/files/stress_and_work_life_balance_in_the_workplace.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0734/files/73246913985.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/bivaloxazonopik.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/76110724889.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/riwes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d2.bin
24c16399dc4901a15db6f044f18769d980b0fd044faac2fb4288955d6c8a7aa3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D2 4636 bytes
font_01_sfnt_off0000714f.bin
818ecf139ade85a271a442b797c82e3ccff8159762ae26a691bfa00b4ff07738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714F 10156 bytes
font_02_sfnt_off00009412.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9412 4324 bytes

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