Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb341a4754549265…

MALICIOUS

PDF

45.1 KB Created: 2020-07-28 01:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bb7b59b5efeae7a76f54c19eff61dc6 SHA-1: d8c931d029a3f540b3b05a50ed2136f6d1751778 SHA-256: fb341a4754549265aa5907012b95a77a9872b9520fa8efee5d1da2a9979310a0
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains text related to academic answers, which could be a lure to encourage clicks on the malicious links.

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=ap%252F+ib+chemistry+ink+chromatography+lab+answers
    • http://files.nomadichorizons.com/uploads/1/3/1/4/131454143/9024914.pdf
    • http://files.leandremeldener.com/uploads/1/3/1/4/131407357/zelinomuz.pdf
    • http://files.dublinselectsoftball.com/uploads/1/3/0/7/130739696/koxepeg-motapo.pdf
    • http://files.tangosverige.com/uploads/1/3/1/8/131857717/2fd9243bb3780.pdf
    • http://files.tangosverige
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/gotumagabanabirafeneg.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9277/files/sodawowume.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/81086136090.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/wavedukorenunuwerurefu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5663/4785/files/vagawe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/646255477.pdf
    • https://cdn.shopify.com/s/files/1/0431/2029/6090/files/68131375824.pdf
    • https://cdn.shopify.com/s/files/1/0439/1131/5611/files/12726744955.pdf
    • https://cdn.shopify.com/s/files/1/0429/4275/9071/files/kosaneg.pdf
    • https://cdn.shopify.com/s/files/1/0431/9966/0194/files/gevebesegorarelutezigev.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2622/files/97996372439.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3112/files/netabebi.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_off000072c8.bin
b319f36c4a6a59f8fe99341d3d6717bb6e53c61a32bb80e7748e63df7f67d56c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C8 5560 bytes
font_01_sfnt_off0000858f.bin
164a773f778ea51a39eebb69d71b3d2e92ffafc16b67739f0bbc8e5ae4500a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x858F 9888 bytes

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