Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c187d46bc2dea37…

MALICIOUS

PDF

45.4 KB Created: 2020-08-05 02:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3de4949539c102953258558d8b5b7b8 SHA-1: bd8c4f9c9e8d80421b7bc09a5eaf331a157f4129 SHA-256: 2c187d46bc2dea37019cd0d2a1b6a9a092a1f25e2e24acbd2ac58bdeabe5fbe5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, pointing to 'https://ttraff.ru/pify?keyword=castrol+edge+5w30+c3+pdf'. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly indicated maliciousness.

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=castrol+edge+5w30+c3+pdf
    • http://files.wakinikonaclub.com/uploads/1/3/2/6/132680796/9583921.pdf
    • http://files.level2rak.com/uploads/1/3/0/9/130969768/6346045.pdf
    • http://files.customuv.com/uploads/1/3/2/6/132695629/zolinogidusal.pdf
    • http://files.melwycked.com/uploads/1/3/1/3/131379706/d95810b97222149.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4179/files/palawarizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2885/6477/files/68618659634.pdf
    • https://cdn.shopify.com/s/files/1/0428/6434/5255/files/nunisaluvebiturumafuku.pdf
    • https://cdn.shopify.com/s/files/1/0429/2696/4903/files/short_man_complex.pdf
    • https://cdn.shopify.com/s/files/1/0440/6486/6469/files/14207677804.pdf
    • https://cdn.shopify.com/s/files/1/0428/0995/0367/files/2346271061.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5746/files/mononomeruzonigosejure.pdf
    • https://cdn.shopify.com/s/files/1/0432/8348/0736/files/sevibi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1479/1069/files/kowufij.pdf
    • https://cdn.shopify.com/s/files/1/0447/6986/9975/files/murach_s_sql_server_2016_for_developers.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/46799525397.pdf
    • https://cdn.shopify.com/s/files/1/0432/9200/0406/files/21757700910.pdf
    • https://cdn.shopify.com/s/files/1/0440/0496/6565/files/kinokesejulebunaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2317/9677/files/oxidative_stress.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_off000050f2.bin
2f76a9331f3fc7773f4206af7209b58fe258809c6ec855f6d9e1e20568930680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F2 5752 bytes
font_01_sfnt_off000064a9.bin
2079ae33ccfaa602b8799eba82da94a4b7d077eb97deda68cde135d69fdd252f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A9 14352 bytes
font_02_sfnt_off00009310.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9310 16144 bytes

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