Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb45a4eafd8026f…

MALICIOUS

PDF

41.3 KB Created: 2020-08-10 08:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 978d13d1a647f8fd53a59139749150a9 SHA-1: df83a18a2131a7f6ee7d007ba9243d8cb433bbc1 SHA-256: cbb45a4eafd8026f92c41d6f76749c77c93d7eb4c76d7f258fb5088a1b4f22fe
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm for SEO poisoning or phishing. The primary malicious URL identified is ttraff.ru, which is used to redirect to other PDF files. No scripts were extracted, but the sheer volume of links and the use of a redirector indicate a malicious intent to lure users to potentially harmful content.

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=numbers+and+dates+in+english+exercises+pdf
    • http://files.unstoppableachievers.com/uploads/1/3/0/8/130873851/a7a77c901.pdf
    • http://jotetetu.vineamentors.com/uploads/1/3/2/8/132816066/mofuzazire_furejapi_buwaxuwatok.pdf
    • http://files.rhdscholar.com/uploads/1/3/0/7/130739318/6676596.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/90222386911.pdf
    • https://cdn.shopify.com/s/files/1/0448/1007/6322/files/87060644981.pdf
    • https://cdn.shopify.com/s/files/1/0433/0474/7168/files/jirozefoziz.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/38540730853.pdf
    • https://cdn.shopify.com/s/files/1/0440/7666/2934/files/32_makeup_brushes_and_their_uses.pdf
    • https://cdn.shopify.com/s/files/1/0431/3543/4901/files/66703359374.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/31583998962.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2679/files/77389876343.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1660/files/88343772341.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/correlation_matrix_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0439/5198/0712/files/sajutenuduw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3747/4466/files/21474280930.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_off000061a5.bin
7b34d117a2a5c671aee9cdab611b1b367d6153a0e4f27430eb0d4b7162cab807		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A5 5744 bytes
font_01_sfnt_off0000750a.bin
f17fac599114703f6458983da6d0857090e5208a46a4d4ea3575e1e45fa6719a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x750A 10256 bytes

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