Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33b42ff4519ee3f…

MALICIOUS

PDF

39.5 KB Created: 2020-08-06 09:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82c135d3b5b415dcdee78f967042db3c SHA-1: 7856a2d23f16ea1dd7a3f720609bedd6395bab35 SHA-256: f33b42ff4519ee3fd7407c4558f1db6187acfa438cd2f96b9debba60ee3988ae
120 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with the primary redirector URL being ttraff.ru. This suggests a link farm or SEO manipulation tactic. The document body contains garbled text but also includes the primary malicious URL and several Shopify-hosted PDF links, some of which are confirmed benign while others are unknown. The heuristic firings strongly indicate malicious redirection and a link farm.

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=anexar+pdf+excel
    • http://files.mytownmarketer.com/uploads/1/3/0/8/130814297/kafisejesemoji-vajakok.pdf
    • http://kinukive.downingcpa.com/uploads/1/3/2/3/132303374/77ec15d5a.pdf
    • http://files.nickandgraceguy.com/uploads/1/3/0/8/130814258/lepazido.pdf
    • http://files.badgerandfox.co.uk/uploads/1/3/0/8/130813447/zabelirupal.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/cambios_psicologicos_en_la_adultez.pdf
    • https://cdn.shopify.com/s/files/1/0429/3237/1622/files/soluzobedimazewenawezemo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/pujariwowobililusoxaxixab.pdf
    • https://cdn.shopify.com/s/files/1/0440/7649/9096/files/acs_organic_chemistry_exam_2016.pdf
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/sidez.pdf
    • https://cdn.shopify.com/s/files/1/0432/9209/8716/files/oracle_database_11g_sql_fundamentals_i.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72890356131.pdf
    • https://cdn.shopify.com/s/files/1/0436/2246/5699/files/21106193609.pdf
    • https://cdn.shopify.com/s/files/1/0433/8669/9925/files/budget_planner_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/9073/8328/files/deep_learning_book_ian_goodfellow.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8864/files/61693036343.pdf
    • https://cdn.shopify.com/s/files/1/0431/6053/5196/files/synonyms_antonyms_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/ganavopawuri.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_off00005df1.bin
557cdc368deae1cc5810ba8b2653195b00d9d64b8fe598b6af0f2f497448fcb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DF1 5028 bytes
font_01_sfnt_off00006f21.bin
ad241ae081d2ed494368866643b5edb06704ca6f5889722edf7e544420b23429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F21 9944 bytes

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