Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f51d5f96ac87ca6…

MALICIOUS

PDF

41.3 KB Created: 2020-08-06 10:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c4eba3cbf51e455b0f18b700a7a4703 SHA-1: ca7de11f9b51f5763b9aa3ffa10de58e2b778aa1 SHA-256: 9f51d5f96ac87ca60bc371c94f2f65f8a761f2f55b75d0e447a4d3fb070b3830
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.com, which is disguised as a document about first aid treatment for burns. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various files, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via a deceptive document.

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.com/pify?keyword=first+aid+treatment+for+burns+pdf
    • http://files.chrismonroestudio.com/uploads/1/3/0/7/130738696/3545677.pdf
    • http://files.iamwhatiart.net/uploads/1/3/0/7/130776445/1360335.pdf
    • http://files.sportscomplexlv.com/uploads/1/3/0/8/130873921/mavemilivirom_bojixomageruga_telarupu.pdf
    • http://files.herestousmovie.com/uploads/1/3/0/9/130969699/pifolawefo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/nomagewesidorekasubebiko.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/pejopegom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39738284996.pdf
    • https://cdn.shopify.com/s/files/1/0432/4671/5040/files/tenoko.pdf
    • https://cdn.shopify.com/s/files/1/0429/9833/3599/files/ap_biology_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/79535795060.pdf
    • https://cdn.shopify.com/s/files/1/0435/4818/0634/files/28501738253.pdf
    • https://cdn.shopify.com/s/files/1/0428/0621/4819/files/commands_in_linux_ubuntu_terminal.pdf
    • https://cdn.shopify.com/s/files/1/0430/5354/7677/files/vizariwoluzexumiteva.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_off00006684.bin
d7b3e0fe3083a657c2ad765094ccb0a3cf1c90fa3d5ad1b5b174475ca7c04e3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6684 5252 bytes
font_01_sfnt_off00007844.bin
8a691c87bfdd6f8e510e2ba60ff004017dbfe07e02f4ce1d2a8fe4aa4d4b888f
pdf-font-stream PDF embedded font (sfnt) at offset 0x7844 9456 bytes