Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e71cd736837c70…

MALICIOUS

PDF

40.1 KB Created: 2020-08-17 17:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 500e18c37bd1cf38ffd1d6c1257b9e7f SHA-1: adc5918db14c8935abac1fc16e81a3830e09e445 SHA-256: a4e71cd736837c707f3e8e5a630e9aaa4604a75db320aaac552ec94d8d19b6e0
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a link farm and a direct link to a redirector, both disguised as relevant content. The primary malicious link, 'https://ttraff.ru/pify?keyword=l1+b+visa+interview+questions+and+answers', is designed to lure victims into clicking through to potentially harmful sites. The document body, though heavily obfuscated, contains references to interview questions and the malicious URL, reinforcing the social engineering aspect.

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=l1+b+visa+interview+questions+and+answers
    • http://files.shoptrueblessings.com/uploads/1/3/1/4/131406684/guvilatakeda.pdf
    • http://xobepovi.brightonholidayhouses.com/uploads/1/3/1/1/131163864/soxuxepatibovul-zetilibawuwapim-niburago.pdf
    • https://cdn.shopify.com/s/files/1/0433/9941/3925/files/how_to_highlight_duplicates_in_google_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/86484189705.pdf
    • https://cdn.shopify.com/s/files/1/0437/9354/7424/files/juvewix.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1254/files/jnv_admission_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/lds_gospel_doctrine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0439/7708/0990/files/apc_5kva_ups_specifications.pdf
    • https://cdn.shopify.com/s/files/1/0429/7365/9290/files/46246672951.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/rinifiza.pdf
    • https://cdn.shopify.com/s/files/1/0428/1470/1735/files/41929008675.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/jalenaxevugugito.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3534/files/exception_handling_in_java_with_example_program.pdf
    • https://cdn.shopify.com/s/files/1/0427/5961/8716/files/psychology_bangla.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_off00005f8f.bin
a0c4ec1a21ddf5b272928e3fc9bc3e9edae6e55cf9272632991846bd79ebb8e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8F 5196 bytes
font_01_sfnt_off00007157.bin
f0f0d8cfdeb97588b37e93b7949ea29fc9e5dbe61a3edeb3d2af7ab43218fb06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7157 9972 bytes

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