Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e6998fea54cc59…

MALICIOUS

PDF

44.7 KB Created: 2020-08-08 07:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31f9a332abad17cc9e982c7b34715591 SHA-1: f51c43a96af45dea191006f8bd0019545f9f26fd SHA-256: a4e6998fea54cc5906cd7a94f925f8c83e5df1f2a2d759c0284fe0ccd691ee3f
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.ru'. The document body, though heavily obfuscated, contains references to PDF files and the redirector URL, suggesting a lure to external content. The presence of numerous links, including those pointing to potentially benign Shopify domains and other unknown domains, indicates a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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/pify?keyword=bescherelle+grammaire+gratuit+pdf
    • http://files.vanambergrealty.com/uploads/1/3/1/4/131407299/bomomokus-lugepekeme-nurutudo.pdf
    • http://files.stevenlangeauthor.com/uploads/1/3/0/9/130969018/7b012d.pdf
    • http://files.apkroad.com/uploads/1/3/2/6/132695829/wumowibe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/cockroach_life_cycle.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67295211500.pdf
    • https://cdn.shopify.com/s/files/1/0431/5614/4282/files/sorting_algorithm_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0435/8651/9195/files/command_prompt_windows_7_commands.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/8808614968.pdf
    • https://cdn.shopify.com/s/files/1/0444/4202/6150/files/center_of_a_triangle.pdf
    • https://cdn.shopify.com/s/files/1/0438/1566/5824/files/24716195838.pdf
    • https://cdn.shopify.com/s/files/1/0437/6667/7655/files/56605507839.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45251784546.pdf
    • https://cdn.shopify.com/s/files/1/0429/2925/8649/files/ac_and_dc_current_difference.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/alimentacion_complementaria_definicion.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb4.bin
49d9384a5869fe5c5f71b65f5f25bd5e5b8032e49437f0b23658fe4bf2f30c4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB4 5284 bytes
font_01_sfnt_off000070aa.bin
27399f7a67023940ac8d92e21eb6dd6874f92c558eec4cd00c30291214a71383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70AA 12116 bytes
font_02_sfnt_off0000967a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967A 4324 bytes

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