Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6290100f82a01d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-21 08:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54b836cc2ba69e0622e2fa4920127450 SHA-1: ab77bcb26b71ab288dd5a33b33f08cb2814ffba0 SHA-256: 3c6290100f82a01d8a1ac337659d7f8b05e608037fb4d11e0227087420c2bddd
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=cielo+talent+email+format'. This URL is part of a link farm designed to attract search engine traffic, further indicated by the 'PDF_SEO_LINK_FARM' heuristic. The document body, though heavily obfuscated, contains the same redirector URL and references to 'Cielo talent email format', suggesting a phishing lure for job opportunities. The file's purpose is to redirect the user to malicious infrastructure.

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=cielo+talent+email+format
    • http://files.windsorpack199.org/uploads/1/3/0/9/130969048/pojajivuli.pdf
    • http://files.marinasouthpiermural2015.com/uploads/1/3/0/9/130969717/866553.pdf
    • http://files.foxxpoolsbycburger.com/uploads/1/3/1/4/131437378/sabitulemumudagori.pdf
    • http://sonojuzim.avsyum.com/uploads/1/3/0/7/130776436/4bfc8af4.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/nexirozelujivuza.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/96015452003.pdf
    • https://cdn.shopify.com/s/files/1/0429/9997/1999/files/murixib.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/change_switch_button_color_android.pdf
    • https://cdn.shopify.com/s/files/1/0439/9579/1518/files/nuwos.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/5197846280.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/compress_file_size_online_reduce.pdf
    • https://cdn.shopify.com/s/files/1/0433/5403/0231/files/apostrophe_worksheet_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0441/0903/7720/files/this_title_is_no_longer_available.pdf
    • https://cdn.shopify.com/s/files/1/0432/7496/1059/files/affairscloud_weekly_december.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1965/files/jebolarexiwezafenukip.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_off000065a5.bin
a59e9aba3a3ba352788f3d5f4999dd787056e6ac1a3589675c7d158670c03e84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65A5 4640 bytes
font_01_sfnt_off0000754b.bin
3ddcaf05536f8d8dd6a1523c249551ce8f2c178de752d3f55ea9b5e4f9d2e905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x754B 10644 bytes

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