Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd826a1c3809e55e…

MALICIOUS

PDF

41.0 KB Created: 2020-08-12 06:10:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3840a241d23c3f5bfdde1ee389be248 SHA-1: d163de670bee1f6851dc69d8b16ac6febd686ef0 SHA-256: bd826a1c3809e55e5e6df4b0c0455dfcc636e6f09462aa55588063090b4310a1
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and text suggesting an IRS publication, likely a lure. The presence of a mass external PDF link farm further indicates a malicious intent to distribute content through deceptive means.

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=irs+publication+525+pdf
    • http://files.vanhornauctions.com/uploads/1/3/2/6/132683088/zizutaluwovejef-dijoxuk.pdf
    • http://files.takeaclasswithlaura.com/uploads/1/3/1/4/131453684/1f777329.pdf
    • http://files.doorway.org/uploads/1/3/0/7/130776499/tixizorozi.pdf
    • http://files.lynnegobioff.com/uploads/1/3/0/7/130738988/3759835.pdf
    • https://cdn.shopify.com/s/files/1/0448/0902/7735/files/south_african_banking_industry_analysis_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/6730/2295/files/sistemas_economicos_capitalismo_y_socialismo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasamonuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/8406/2622/files/dunukirumimulono.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/46771001319.pdf
    • https://cdn.shopify.com/s/files/1/0433/2398/1979/files/fuzajirisorizun.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/mvp-_pay._msxi._com.pdf
    • https://cdn.shopify.com/s/files/1/0432/9046/0324/files/uric_acid_test_kit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/wordly_wise_3000_book_7_test.pdf
    • https://cdn.shopify.com/s/files/1/0428/6778/5884/files/65127092842.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_off0000611c.bin
b09e021460be512dc18b468c4b04647f031aa56388e18d66c3f4792a49667176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611C 5480 bytes
font_01_sfnt_off000073c5.bin
71cadee02f30bb34013597c6802a83e39c49793c9d0c75a48c70dc668dec4fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C5 10544 bytes

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