Malicious PDF — malware analysis report

Static analysis result for SHA-256 59b2ce7d53f45ccf…

MALICIOUS

PDF

45.3 KB Created: 2020-08-15 09:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00e366cef51fd8036296177fdab2ff33 SHA-1: 27ba8d8cc19770e223190d91dd613a6456eaaafa SHA-256: 59b2ce7d53f45ccfc41ddc05854baf5a073f1a8baa07c6508bc80e24d5b38b7c
150 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at `ttraff.cc`. The document body, though heavily obfuscated, contains text related to a 'buderus g115 service manual', suggesting a lure to trick users into clicking the malicious link. The presence of a PDF link farm heuristic further indicates an attempt to distribute content via external links, potentially for SEO poisoning or to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious.

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.cc/wb?keyword=buderus%20g115%20service%20manual
    • http://files.ecowoodbarsandmore.com/uploads/1/3/1/8/131871424/8265122.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4028/files/5777522318.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/love_breakup_status_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0438/4853/2128/files/wejenuduku.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/lugenetesufesukomekevofed.pdf
    • https://cdn.shopify.com/s/files/1/0432/7378/1411/files/86616292284.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/ievan_polkka_miku_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/5385/9494/files/agri_fab_lawn_vacuum.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/wigozabijasiditu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6867/0620/files/zejofunodir.pdf
    • https://cdn.shopify.com/s/files/1/0438/4666/4349/files/pewol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zosakasebiribo.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_off0000740c.bin
e5df5e03b1eeab721a4cb231359aac7c418903554c20d922461aa70b9e43d3ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x740C 5544 bytes
font_01_sfnt_off000086d3.bin
e29471c40de984d27189c9ea079dd309dfce3ba0d077e4f7927ab7a292ca4621		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D3 9968 bytes

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