Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2ecebfdfff67a6…

MALICIOUS

PDF

45.3 KB Created: 2020-08-21 09:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9db416b6f4a73a58d01c0d52bdb2f08e SHA-1: 27919e30fdd5bfab176be2bd506bf3b88c51d225 SHA-256: ab2ecebfdfff67a6b4a4c3d24213db9fad8a46177c6f9baa4a62850fa35c59fa
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to sheet music, likely serving as a lure. The PDF also contains a large number of external links, as flagged by PDF_SEO_LINK_FARM, suggesting an attempt to abuse search engine optimization for distribution. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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=carol+of+the+bells+easy+sheet+music
    • http://files.flintmetroleaguesports.com/uploads/1/3/2/6/132695535/nawivukur.pdf
    • https://cdn.shopify.com/s/files/1/0432/2911/8627/files/nedukoweger.pdf
    • https://cdn.shopify.com/s/files/1/0432/7525/5972/files/54771745043.pdf
    • https://cdn.shopify.com/s/files/1/0431/1272/6677/files/monthly_expenses_excel_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6509/files/78354662502.pdf
    • https://cdn.shopify.com/s/files/1/0430/4207/8877/files/xolimolebite.pdf
    • https://cdn.shopify.com/s/files/1/0428/5382/6726/files/80778222238.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8824/files/the_handbook_of_stress_neuropsychological_effects_on_the_brain.pdf
    • https://cdn.shopify.com/s/files/1/0433/4934/4421/files/amar_ujala_hp_epaper_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/5856/1173/files/audit_associate_interview_questions_and_answers.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_off0000647c.bin
0047be47bf42f416d193d7f172df504062fb86ce0c3ba95806621d4cebab366d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647C 5268 bytes
font_01_sfnt_off00007649.bin
8605ddc84cff9794eb7479f77a8f22c32c8a4259376e649ac755c9c2142fd161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7649 15560 bytes

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