Malicious PDF — malware analysis report

Static analysis result for SHA-256 f446dd7cf3619d86…

MALICIOUS

PDF

32.5 KB Created: 2020-08-23 05:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af651852d379fef1101413304385b4a4 SHA-1: d7c73ae5cd112ac4f78ee78e3a50a6dc7190e990 SHA-256: f446dd7cf3619d8620f9e5fa3d838d7c13cb3c69264c7bd8588521bc43f28358
150 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high number of embedded links, many of which lead to a redirector service. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the URL 'https://ttraff.ru/pify?keyword=sad+alone+wallpaper+hd', which is identified as a malicious redirector. This suggests the PDF is designed to lure users to malicious content through a chain of redirects.

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.ru/pify?keyword=sad+alone+wallpaper+hd
    • http://vebal.antoniofamilyfoods.com/uploads/1/3/2/6/132683168/5041537.pdf
    • http://files.nestlingtrust.co.uk/uploads/1/3/1/0/131069899/jelek.pdf
    • https://cdn.shopify.com/s/files/1/0434/7710/6838/files/40232037906.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/latex_hide_text.pdf
    • https://cdn.shopify.com/s/files/1/0432/6493/4043/files/teroguxetesuratakefokunez.pdf
    • https://cdn.shopify.com/s/files/1/0433/7333/0586/files/template_x_banner_cdr_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6833/2959/files/aws_auto_scaling_cloudformation_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/61278585186.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9816/files/bourbaki_set_theory.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/jijuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/3120/6808/files/number_analogy_reasoning.pdf
    • https://cdn.shopify.com/s/files/1/0435/3979/2021/files/87074253841.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31240515614.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_off000043bc.bin
af034d29bb7c343689ac1e50477a634eab0021b747ec8201f4843c6972ff8539		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43BC 5064 bytes
font_01_sfnt_off000054f1.bin
fe4eee365f40a74277674503efcbf521f5f42f29d8ce38b299998841c737b309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54F1 9612 bytes

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