Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3380ebcbbb0c00b…

MALICIOUS

PDF

42.6 KB Created: 2020-08-23 06:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 858d6d120839b93de9b6d1beff3bb89e SHA-1: 31a935adcf238f7c378f69ab26ab012be6fbcd2d SHA-256: a3380ebcbbb0c00b0ab43acfe37b73ca7cf8e345182103ed6802d303317999d8
120 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link redirecting to malicious infrastructure. The primary malicious URL is https://ttraff.cc/pify?keyword=spelling+bee+words+for+adults+pdf, which is likely used to distribute further malware. The document body itself is heavily obfuscated but contains references to the malicious URL and numerous other benign-looking PDF links, suggesting a social engineering tactic to mask malicious activity.

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=spelling+bee+words+for+adults+pdf
    • http://files.ftjbymelissa.com/uploads/1/3/1/3/131379382/821329.pdf
    • http://xojire.michaeljperkinsschool.org/uploads/1/3/1/4/131437626/035437631ecce9.pdf
    • http://files.palmettoeap.com/uploads/1/3/0/8/130874496/sasogipuzezefisi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3967/6821/files/difference_between_budgetary_control_and_standard_costing.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1713/files/97173062202.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3815/files/appraisal_form_2055.pdf
    • https://cdn.shopify.com/s/files/1/0437/2312/8986/files/aldehydes_and_ketones_chapter.pdf
    • https://cdn.shopify.com/s/files/1/0433/8306/2678/files/jofamewokem.pdf
    • https://cdn.shopify.com/s/files/1/0431/2052/5476/files/mibavobuviwuvufav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/64457472993.pdf
    • https://cdn.shopify.com/s/files/1/0438/2192/4514/files/autodesk_autocad_2018_update.pdf
    • https://cdn.shopify.com/s/files/1/0447/9719/8487/files/sap_accounts_payable_transaction_codes.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/29456599332.pdf
    • https://cdn.shopify.com/s/files/1/0430/9087/0423/files/61060159125.pdf
    • https://cdn.shopify.com/s/files/1/0434/9558/8005/files/78965726976.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_off000067ad.bin
274bcf5a64b21319d9836ed6f750f860a747fd9c37d4e1ff93df0f5533ccd2f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AD 5544 bytes
font_01_sfnt_off00007aa4.bin
1eba6d150f99899209024ff82d4597a19e88d046bac76c056e98bcafbaa77242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA4 10188 bytes

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