Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf064a658ae191ec…

MALICIOUS

PDF

48.9 KB Created: 2020-07-09 22:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29dd22d897c82476c1891e9363c949af SHA-1: c9bbf054c33efa70acc6cef05424495c5a2b37e3 SHA-256: bf064a658ae191ec85bfb0b97d7bc14aad7b10f915a8a48cff55703231881046
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a 'Hot springs spa manual 2017'. The document also functions as a link farm, pointing to numerous other PDF files hosted on various domains, suggesting a broad distribution effort. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains suspicious elements like duplicate object bodies.

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.ru/wb?keyword=hot%20springs%20spa%20manual%202017
    • http://files.saujs.co.za/uploads/1/3/2/6/132681824/8694376.pdf
    • http://files.kingfisherpbs.org/uploads/1/3/2/6/132681602/fbc377f49.pdf
    • http://files.hlhas.com/uploads/1/3/1/4/131483550/wuvoxipepuzan.pdf
    • http://files.txpunk.net/uploads/1/3/0/7/130776578/36e3926afd116.pdf
    • http://files.themudlakeproject.ca/uploads/1/3/1/4/131407665/2735271.pdf
    • http://files.just-verandas.com/uploads/1/3/1/3/131379045/xobuxisedujus_wekabod.pdf
    • http://files.lovemadebyketurah.com/uploads/1/3/1/4/131453869/bosun.pdf
    • http://files.head-to-toe-ministries.com/uploads/1/3/0/7/130776826/4207017.pdf
    • https://serumaputafe.files.wordpress.com/2020/06/xezitapizexusuj.pdf
    • https://lezidonopo.files.wordpress.com/2020/06/17296605022.pdf
    • https://kagowujaludu.files.wordpress.com/2020/07/xivebitep.pdf
    • https://xupapinir.files.wordpress.com/2020/07/fadedon.pdf
    • https://finegul.files.wordpress.com/2020/07/jabifemunemevuparixap.pdf
    • https://mudobemazi.files.wordpress.com/2020/06/10554338320.pdf
    • https://gefujonusa.files.wordpress.com/2020/06/febonuwakewulixiguw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/79265304831.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dosadibevejigavo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/55497749658.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54748680829.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bamizubonofosexewa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.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_off00007fa9.bin
3b805a67a963bd25d04ba700a2636cfc10f14b43266278722710354e708749ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FA9 5268 bytes
font_01_sfnt_off0000917b.bin
f11cab162993a7c5e21eec631364c7b86112b3d7177c6e265e91e2225a87c36c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x917B 10828 bytes

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