Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c9b68f67ae42e4…

MALICIOUS

PDF

53.2 KB Created: 2020-08-11 06:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0274367b5c7e8e23f498a2ab6fb305da SHA-1: 62ed832b58800f310e158e62b5b0384d0cc6c7ac SHA-256: e0c9b68f67ae42e4ee93e16107aaef898ad391a8fba5bb2d815c15f3df7b203c
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a redirector at 'ttraff.ru' which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'algebra mathematics books pdf' and the URL 'https://ttraff.ru/wb?keyword=algebra%20mathematics%20books%20pdf', suggesting a lure to a malicious site. The PDF also contains a large number of external links, many pointing to Shopify domains, which is indicative of a link farm used for SEO poisoning or traffic redirection.

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=algebra%20mathematics%20books%20pdf
    • http://files.jcuso.org/uploads/1/3/1/6/131636825/tagodarudovusamobij.pdf
    • http://files.backingevents.com/uploads/1/3/1/4/131453329/wefelekawisofesa.pdf
    • http://files.multiplatformmastermind.com/uploads/1/3/1/3/131398322/wikuxovimobomozaju.pdf
    • http://files.jamesmatthewwilson.com/uploads/1/3/1/6/131637057/d1e23bb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/tilupaniserupudegelo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/favuzixowuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/4333/2000/files/tufoli.pdf
    • https://cdn.shopify.com/s/files/1/0440/7430/3638/files/first_data_fd410_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/9279/3757/files/xepepo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6018/9594/files/action_verbs_worksheet_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/50558107485.pdf
    • https://cdn.shopify.com/s/files/1/0438/2015/5037/files/kiwudusaxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7287/1832/files/72942537271.pdf
    • https://cdn.shopify.com/s/files/1/0433/9338/4599/files/sodewofelevebibotuw.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_off00009110.bin
d069f09b7af95f7c7667f797a1c9f1277b85baf216a3cc0c4b5468aeee2dd9db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9110 5760 bytes
font_01_sfnt_off0000a478.bin
8f849ebfd6eef6e58d4a2ec74e7e9d615c5dba5f6ab6c27043faf720945a6bec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA478 10508 bytes

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