Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67116697311ed38…

MALICIOUS

PDF

47.4 KB Created: 2020-08-19 11:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2316bddbf72ecf9f8bba73734d07f089 SHA-1: 01c4679e341ddce1a780a54bfe6eaf5ca707f6bd SHA-256: e67116697311ed388f64dc379dacc4abffe2bf78ea414bc39f4d0464feeb9d41
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=free+holiday+templates+for+flyers', suggesting a lure to download potentially malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports the malicious intent.

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=free+holiday+templates+for+flyers
    • http://files.charpentierteam.com/uploads/1/3/1/1/131164002/8186607.pdf
    • http://files.mountainandwaterstudio.com/uploads/1/3/0/7/130776578/929aa25ec86b.pdf
    • http://bozuxemo.omahadeckcontractor.com/uploads/1/3/0/9/130969742/8872568.pdf
    • http://senafuko.thingsgreen.com/uploads/1/3/1/8/131857419/3874076.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/52822723768.pdf
    • https://cdn.shopify.com/s/files/1/0444/6614/3399/files/ashampoo_burning_free_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/51939006761.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/baptist_church_administration_and_management.pdf
    • https://cdn.shopify.com/s/files/1/0432/3531/1775/files/core_curriculum_for_holistic_nursing.pdf
    • https://cdn.shopify.com/s/files/1/0433/9564/5589/files/vimukitepomivamenikoxisu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8009/7687/files/shirogane_castle_walls.pdf
    • https://cdn.shopify.com/s/files/1/0430/9549/0721/files/mamezenifonirodamutufowup.pdf
    • https://cdn.shopify.com/s/files/1/0440/4042/1541/files/dd_form_1380_field_medical_card.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gamusuzojikifikukudubug.pdf
    • https://cdn.shopify.com/s/files/1/0454/6487/9256/files/pdf_bestand_verkleinen_windows.pdf
    • https://cdn.shopify.com/s/files/1/0432/6876/7912/files/aspera_client_user_guide.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_off00007af2.bin
c185fcb7532514c4740bff026b187ff075b7ed0c9eaacb1a18352768bbc6c7fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF2 5340 bytes
font_01_sfnt_off00008cff.bin
131c9efac628eb13eb086dbb876d975626a4d56c18585f38fd5dfdcf2b5b4209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CFF 10400 bytes

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