Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4dcdc5a6c0ff182…

MALICIOUS

PDF

39.6 KB Created: 2020-08-18 16:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 48b10dc0de8d90fe0a264be90d3f536b SHA-1: ea0409c70aab7ee54cf90432136c34675afcadc6 SHA-256: b4dcdc5a6c0ff18233a8088ad6afd76e4b97322d19a67520a549981ab08bdcc0
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and text related to a termination agreement template, suggesting a social engineering lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve search engine ranking for malicious content or to obscure the primary malicious destination.

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=termination+agreement+template+south+africa
    • http://wutef.estesartsdistrict.org/uploads/1/3/0/8/130814575/30b4e44f3648.pdf
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/sepsis_puerperalis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0437/4436/2647/files/zugos.pdf
    • https://cdn.shopify.com/s/files/1/0434/2310/5175/files/atcom_module.pdf
    • https://cdn.shopify.com/s/files/1/0434/1877/9800/files/oxitetraciclina_en_bovinos.pdf
    • https://cdn.shopify.com/s/files/1/0437/2607/8106/files/uml_con_rational_rose.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5979/files/vusinamoti.pdf
    • https://cdn.shopify.com/s/files/1/0435/5696/2465/files/dijkstra_s_algorithm_pseudocode.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5190/files/34790004463.pdf
    • https://cdn.shopify.com/s/files/1/0433/2732/4310/files/kiledon.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/nexulafibexatosumokaxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7355/1001/files/2s_complement_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7966/files/gisuvazuzedeko.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6080/files/tomogomazubuz.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_off00005bb6.bin
a7cd7033e7e8725b080e3dd89f990fccd976a330df2e04f7fa562c152edfe7fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB6 5380 bytes
font_01_sfnt_off00006dd5.bin
f6f3d93e79e3f171f99327c50ff13b0da7f8d0188ba6a4ca72f42b26b22c6401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD5 10396 bytes

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