Malicious PDF — malware analysis report

Static analysis result for SHA-256 c387ce73ec154aa9…

MALICIOUS

PDF

79.9 KB Created: 2020-08-05 12:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 554462b1c8b81d102491211f0fa87d27 SHA-1: 67ff8212a7ea2f8cbb7cd144df3c78754abc6dff SHA-256: c387ce73ec154aa9c84894544b50bd5228ef10e2d38d6225e37de7fbeac8f90d
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic match for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. The embedded URL, 'https://ttraff.cc/pify?keyword=ielts+speaking+part+2+questions+and+answers+top+50+pdf', is the primary indicator of this malicious redirection. The document body, though heavily obfuscated, contains text related to IELTS speaking materials, suggesting a lure to entice users to click the malicious link. No scripts were extracted, and the PDF structure itself is the vector for the attack.

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=ielts+speaking+part+2+questions+and+answers+top+50+pdf
    • http://files.burstpublishing.com/uploads/1/3/0/8/130814065/wezevuwuve-kujawativov-weverakaxuke-xakatepikij.pdf
    • http://files.guelpherrands.com/uploads/1/3/1/4/131437074/5ca768ce24e63.pdf
    • http://files.saikmusic.org/uploads/1/3/2/7/132740415/67c8893d65fe7.pdf
    • https://cdn.shopify.com/s/files/1/0440/6309/6984/files/6003782773.pdf
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/kakozibovazonomubepez.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/36774201676.pdf
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/xebaw.pdf
    • https://cdn.shopify.com/s/files/1/0437/4917/9541/files/dibajajaboz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7909/6728/files/55653405544.pdf
    • https://cdn.shopify.com/s/files/1/0434/1684/6488/files/10860844648.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/vezaduxunobemolujanib.pdf
    • https://cdn.shopify.com/s/files/1/0429/3066/7673/files/31810308570.pdf
    • https://cdn.shopify.com/s/files/1/0435/4605/0728/files/tivakijifezajixitumedep.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48695811849.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/mutoroxosafapajotow.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_off0000f9fa.bin
4fb96631a3f48a632cf5250abdfba109d36ce7781e6f31a67f766c64bc9f0b36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 5828 bytes
font_01_sfnt_off00010dee.bin
2c9d9b546dc4dbc2621b6388f1dd8e3b7cc0f11597af07b9ad5df384ef067ced		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEE 10552 bytes

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