Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2483b84135ca30b…

MALICIOUS

PDF

40.9 KB Created: 2020-08-04 11:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86f9ed30e6d267ffc9b070773571cc70 SHA-1: 7ed83e3561cc999068515ba3f8384469c7ef22d9 SHA-256: c2483b84135ca30ba511948a2a7d5795fe540d4c27bd57a73cbd6d1a53a985db
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 of which point to Shopify domains hosting PDF files, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, https://ttraff.cc/pify?keyword=best+books+of+all+time+pdf, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains this URL, reinforcing its role in the attack. The file was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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=best+books+of+all+time+pdf
    • http://files.bamboolearners.com/uploads/1/3/1/6/131606256/b9d05f0b185252.pdf
    • http://files.mechanismus.net/uploads/1/3/0/7/130775539/9b703359.pdf
    • http://files.relentlessbydasani.com/uploads/1/3/0/8/130814043/8049384.pdf
    • http://files.santosayogaandhealth.com/uploads/1/3/0/7/130775382/lawosolag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/11067845032.pdf
    • https://cdn.shopify.com/s/files/1/0432/3157/6231/files/blank_risk_assessment_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/5572/6238/files/70275525546.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0350/files/lutug.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0985/files/bogit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/artificial_neural_network_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/kegalegudij.pdf
    • https://cdn.shopify.com/s/files/1/0435/1927/9258/files/yeah_yeah_yeahs_maps_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0435/6043/5871/files/50280507564.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/nazugagikad.pdf
    • https://cdn.shopify.com/s/files/1/0430/5489/1161/files/nero_welcome_reality.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_off000061a9.bin
f35ed303a647a1b5c947c25fc6a072b842539092b8fca368ddaac0e328acba4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61A9 5344 bytes
font_01_sfnt_off000073ca.bin
d3ff286903e509f2f9bf97715cfeba9550acbeb11e77885a8518ea6336eb64d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73CA 10232 bytes

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