Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82d9e73acc5ebcd…

MALICIOUS

PDF

46.6 KB Created: 2020-07-24 21:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab864ee67cc2049ca01a6d01601eb316 SHA-1: aab657e36152b8a47e2ce6854b73263d25a16aa2 SHA-256: b82d9e73acc5ebcdb787597d0f618b00d6c7cdae78f54c53d3cedca786ceeb4b
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, with numerous external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be malformed or truncated, preventing a more detailed analysis of its content's intent beyond the observed redirection and link farming.

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/pify?keyword=shinesoft+broadcasting+software
    • http://files.frczyouth.org/uploads/1/3/1/3/131384679/wupeveteter.pdf
    • http://files.monkeymadnessfunbus.co.uk/uploads/1/3/2/7/132740375/9516346.pdf
    • http://files.christophermnelson.com/uploads/1/3/0/9/130969313/nijuzapi-vexavebazumu-jujinijoxutu-kupok.pdf
    • http://files.deathandseparationbook.com/uploads/1/3/2/6/132682039/5419355.pdf
    • http://files.deathandseparationbook.com/
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/72958596495.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/dexezuduwerawomogefek.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/nisupo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zutazalurofesavasa.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/43235939031.pdf
    • https://cdn.shopify.com/s/files/1/0440/3603/0614/files/zowadasexunobetojute.pdf
    • https://cdn.shopify.com/s/files/1/0432/8570/8953/files/wuzutokuregebaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/buxidumex.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6053/files/26430578824.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/gilit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lunizededalusabunis.pdf
    • https://cdn.shopify.com/s/files/1/0435/3087/9125/files/bujan.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_off0000771c.bin
b98d557051d9ef5282117bcb8eb0cc967a53ac8808cdfec1bad87c4c3176c5e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x771C 5376 bytes
font_01_sfnt_off00008955.bin
a2b9ce68d7a3249bead13c713380c329a72b48171cba7b30e2b4a48ce9403add		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8955 10588 bytes

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