Malicious PDF — malware analysis report

Static analysis result for SHA-256 45317bf65a74e563…

MALICIOUS

PDF

46.5 KB Created: 2020-07-30 14:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04b693e95daedaa595ea508b66b3d84a SHA-1: c633d12b6584f2e5a08cd55c6debaed5f1fc4319 SHA-256: 45317bf65a74e563128e128d28aa40e56cbc69b005b97ba21c48ef7f483a93ba
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The embedded URL points to a redirector, and the document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create SEO spam or phishing documents. The presence of numerous external links, including one to a known malicious redirector, strongly suggests an attempt to lure users to malicious sites.

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/wb?keyword=words%20to%20use%20instead%20of%20very%20pdf
    • http://files.aleecheapitts.com/uploads/1/3/2/6/132695492/zelidiretanupiv_kejuluba.pdf
    • http://files.hccmansfield.com/uploads/1/3/1/3/131383630/bd20b8a.pdf
    • http://files.amelafrica.com/uploads/1/3/0/7/130775866/be0a5d40f6e.pdf
    • http://files.ogkquote.com/uploads/1/3/0/9/130969183/geragi-nazunosoros-nidesa-teziwibefofelir.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38935964995.pdf
    • https://cdn.shopify.com/s/files/1/0429/2391/7475/files/kenabuvire.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/36649983447.pdf
    • https://cdn.shopify.com/s/files/1/0428/5916/7900/files/27957812692.pdf
    • https://cdn.shopify.com/s/files/1/0433/5969/9109/files/92959062016.pdf
    • https://cdn.shopify.com/s/files/1/0437/6592/3997/files/74201634892.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/39224062563.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/67176512744.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/686402313.pdf
    • https://cdn.shopify.com/s/files/1/0436/2482/4995/files/tugetoginojoguxubuwa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/fegegi.pdf
    • https://cdn.shopify.com/s/files/1/0440/1194/6134/files/1909691062.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/58058377749.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0439/9661/0718/files/37439392471.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_off000078ea.bin
48db3a0876c89f94cd949cbf03a47d0eb995490830c7155ce6aacbb97ceb5ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78EA 5060 bytes
font_01_sfnt_off00008a44.bin
e4e94b52121ac8b9d708e9fdfdb1f847b1dd0620a24fe9ec9576c606508e22a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A44 10092 bytes

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