Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb993216c506bb7e…

MALICIOUS

PDF

31.7 KB Created: 2020-08-25 03:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9af12a25db8b9cc37f421c5cdf4fc0d SHA-1: f465815f430552003cfd912f50a41682622af79e SHA-256: cb993216c506bb7ef8628b2c8f09ea0898d50ee3ecb9770f8f1129d4f8081fbb
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of embedded external links, suggesting a link farm or SEO manipulation tactic. One of the primary links directs to 'ttraff.ru', a known malicious redirector. The document body contains garbled text but includes the same malicious URL, reinforcing its purpose. No scripts were extracted, but the sheer volume of links and the malicious redirector indicate a high likelihood of malicious intent, possibly to lead users to phishing sites or malware downloads.

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=bmw+car+photos+hd
    • http://sixale.artfrancois.com/uploads/1/3/2/6/132682467/cb36cd9.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7484/files/tutorial_on_vba_for_excel_macros.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3303/files/92193723894.pdf
    • https://cdn.shopify.com/s/files/1/0465/2548/1110/files/horse_racing_odds_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0454/2988/3048/files/re_authorization_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/58745671983.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/92397687205.pdf
    • https://cdn.shopify.com/s/files/1/0433/2329/3864/files/jofozikixobevewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/51333185018.pdf
    • https://cdn.shopify.com/s/files/1/0431/1495/4908/files/nujigojunanavidaw.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/54212470272.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/49510946094.pdf
    • https://cdn.shopify.com/s/files/1/0430/5944/5914/files/thomas_calculus_11th_edition_solved_notes.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_off000040ca.bin
175fb34340d2fea61a5f372cf0ccadade7a66d28669a2431e0458e065228a11e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40CA 5420 bytes
font_01_sfnt_off00005319.bin
94ca141a0cfae4cb0cb62800717984ccd42814f954848bfa224796bb73dfdc74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5319 9284 bytes

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