Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac2239fb5dff511…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 18:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efbefee2ce3899e7d83aa9bff628656b SHA-1: 3a47fdfa24273e8b4248035592699ec681c49397 SHA-256: 8ac2239fb5dff511c15b9b2895445a2ea1df1d8ee6452f98c77cd6eccf5310e6
70 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, appears to contain the URL and a lure related to educational worksheets. The presence of a 'download button' heuristic further suggests a social engineering attempt to entice users to click the malicious link. The primary IOC is the malicious redirector URL.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=acids+bases+and+salts+class+7+worksheets
    • http://files.jwandersonjr.com/uploads/1/3/1/1/131164546/zonakajatot.pdf
    • https://cdn.shopify.com/s/files/1/0437/1070/9913/files/75026904932.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8714/files/detoxezimifibawo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0065/9100/files/naresadakinu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2571/8678/files/fundamentals_of_molecular_virology.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/biomass_based_power_generation.pdf
    • https://cdn.shopify.com/s/files/1/0430/9660/4825/files/destin_surf_report.pdf
    • https://cdn.shopify.com/s/files/1/0428/9776/8614/files/87662374281.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_off00006c48.bin
f8c9d5e34888f8033cca59382868bdfb4f052c57694f212b3cc869f4345b073c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C48 5392 bytes
font_01_sfnt_off00007ea1.bin
7619e5a854327c709c89ed9346cf4c5049fe8d450011c5f7a627334eaa5e9416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA1 10100 bytes

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