Malicious PDF — malware analysis report

Static analysis result for SHA-256 d457a4d8c280d9a5…

MALICIOUS

PDF

42.4 KB Created: 2020-08-04 19:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04859a77dd11e3be3a521994ee8d5e2d SHA-1: 2e17e9850f96d3852a15fcb806bfc3bc3c01e4b9 SHA-256: d457a4d8c280d9a5db583cc7a5c37e285962cec68903e3c976c17dede3982d98
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to 'Capitalization worksheets 6th grade pdf' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=capitalization+worksheets+6th+grade+pdf
    • http://files.sandrakreps.com/uploads/1/3/1/3/131384778/4753340.pdf
    • http://files.livingstonworkforceservices.com/uploads/1/3/0/8/130874055/e3adc.pdf
    • http://files.hudsonvalleygarlicgrowers.com/uploads/1/3/1/0/131070859/gabugalam-pugobajepir.pdf
    • http://files.stmva.org/uploads/1/3/1/4/131453248/rulemubezirowexo.pdf
    • https://cdn.shopify.com/s/files/1/0447/3847/8229/files/calendar_2020_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/7860632010.pdf
    • https://cdn.shopify.com/s/files/1/0432/7335/5424/files/git_init_repo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0435/9605/4690/files/auditing_arens_bahasa_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/74980741617.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9452/files/vikujujidop.pdf
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/50068644811.pdf
    • https://cdn.shopify.com/s/files/1/0431/1557/7504/files/nebivigibiza.pdf
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/95050038326.pdf
    • https://cdn.shopify.com/s/files/1/0436/4628/8025/files/57355487923.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_off00006720.bin
3a9731a19e47bf143f734cd0c16b1053681a38345fda54ec0d6265ba0fa0b74c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6720 5568 bytes
font_01_sfnt_off00007a23.bin
ab19cb0ddc710478d87dbd120dcaf2f19952d0489c465b6169f72b8769eb9ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A23 10104 bytes

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