Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8daa8231adf534…

MALICIOUS

PDF

62.4 KB Created: 2020-08-07 23:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab48927add58b06502bb9fa81c30200c SHA-1: 48b4cc19407f5259b493a182f9c5102d7e97c5c7 SHA-256: 8b8daa8231adf534c354b812cfbb5110ba45fa1677c5a746c8ac648f00650a7d
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=administracion+de+peque%25C3%25B1as+empresas+anzola+pdf'. This indicates the document's primary purpose is to lure the user to this malicious URL. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to improve the ranking of the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=administracion+de+peque%25C3%25B1as+empresas+anzola+pdf
    • http://files.deeprootscider.com/uploads/1/3/1/4/131438419/9760240.pdf
    • http://kosep.besttoyou.net/uploads/1/3/1/1/131164250/kinopudadon-wadekemus-kowiwe-kigar.pdf
    • http://files.wccperk.org/uploads/1/3/1/4/131483184/9504171.pdf
    • https://cdn.shopify.com/s/files/1/0437/4511/6311/files/jenerasemutuzopepusuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1700/2405/files/domasugazas.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/andrea_camilleri_libri.pdf
    • https://cdn.shopify.com/s/files/1/0434/6609/6802/files/aqua_rite_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/5193/4108/files/31597594827.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1973/files/5716357631.pdf
    • https://cdn.shopify.com/s/files/1/0436/8600/2838/files/52278066981.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/xiwokilamed.pdf
    • https://cdn.shopify.com/s/files/1/0438/2621/7120/files/mad_catz_rat_9.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7621/files/chinese_characters_a_genealogy_and_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0443/4237/8652/files/algebra_1_common_core_textbook_online_free.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_off0000b1de.bin
c003d69f9eaec818866b7f74856412ba8602e8794807f4cc64ed1ed56288e2e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DE 5680 bytes
font_01_sfnt_off0000c4df.bin
6cdf3f239af168e8bd5de459be80f78ed601022551106546a0ad47bc5635de0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DF 11464 bytes

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