Malicious PDF — malware analysis report

Static analysis result for SHA-256 6246dd8234e6b60b…

MALICIOUS

PDF

40.7 KB Created: 2020-07-08 18:39:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 676eaef87ea7dce35586c07f8a410bab SHA-1: 3abb0e1c0208760deb831c1ab3983026fa0a523d SHA-256: 6246dd8234e6b60b6e5b2a4f634cbe4b85ad08366ed26f482d443f3d7a89095f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to numerous external PDF files, with one redirecting to known malicious infrastructure. The embedded link action in the PDF document itself contains a long list of URLs, suggesting a mass distribution or SEO poisoning attempt. The ML classifier strongly indicated maliciousness, supporting the conclusion that this document is designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wb?keyword=flattened%20vs%20unflattened%20pdf
    • http://files.upwellings.com/uploads/1/3/1/6/131607174/c3eb020e.pdf
    • http://files.nancythomas.org/uploads/1/3/0/8/130814189/905986.pdf
    • http://files.sevenstarsselfcatering.co.uk/uploads/1/3/1/3/131379552/4308544.pdf
    • http://files.sisterlocks.com/uploads/1/3/1/4/131437636/f1af154bc5d2.pdf
    • http://files.chardoncommunityactionteam.org/uploads/1/3/1/3/131384018/pugotut-newifuniz.pdf
    • http://files.hlhas.com/uploads/1/3/1/4/131483550/wuvoxipepuzan.pdf
    • http://files.jonathankotyk.com/uploads/1/3/0/7/130738562/noxewakomu.pdf
    • http://files.ieleaders.net/uploads/1/3/0/7/130776718/45c35ab516bd.pdf
    • http://files.wpbchiropractor.com/uploads/1/3/1/8/131856950/7241857.pdf
    • http://files.constancewashburn.com/uploads/1/3/2/3/132302810/dupid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://gexefaduxoka.files.wordpress.com/2020/07/48237182085.pdf
    • https://gukegowiv.files.wordpress.com/2020/06/fiveta.pdf
    • https://rotuwepene1407802.files.wordpress.com/2020/06/28266905475.pdf
    • https://nedidama.files.wordpress.com/2020/07/ponugufobofelepinevexom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3789128943.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sivezijikok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20424522606.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/miveguxuxububepevomozit.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nagexonulelaxefirulilona.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e9.bin
e14e558f40ab3704a666b60324b78a9c3073ecb53f008f216d4d5cd3a0e20fe6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E9 4680 bytes
font_01_sfnt_off000074e7.bin
486c15143211ae7b6a7d9c939e378c85ac2cae093d54c77d629a6db78cc541d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E7 9560 bytes

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