Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba6cf1706c954d8…

MALICIOUS

PDF

42.2 KB Created: 2020-08-05 16:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1748b4dd4bb61fa4ea0e06928cea4e51 SHA-1: 040cf4a45aee8d94768a91c4031d382fd8085988 SHA-256: 8ba6cf1706c954d88e8c4ea4b4969a00580c8b7c19dc4fc569225f96155f68db
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=la+hija+del+vampiro+triunfo+arciniegas+pdf, which is also flagged as a malicious redirector. This suggests the primary purpose is to lure users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=la+hija+del+vampiro+triunfo+arciniegas+pdf
    • http://files.gold-condominium.com/uploads/1/3/0/8/130873795/ronufunudazukelisu.pdf
    • http://dezur.kingdom-institute.org/uploads/1/3/1/4/131453541/e007fa48dd4a15f.pdf
    • http://files.cfolcconference.com/uploads/1/3/0/8/130814674/0295d068e82972.pdf
    • http://files.pjuncaged.com/uploads/1/3/1/1/131164295/4984955.pdf
    • http://files.lindabarboni.com/uploads/1/3/0/9/130969592/0381afff6410.pdf
    • https://cdn.shopify.com/s/files/1/0428/2515/4716/files/19424676915.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/79582418136.pdf
    • https://cdn.shopify.com/s/files/1/0429/6962/8828/files/2002_buick_rendezvous_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6037/9286/files/virabagajupel.pdf
    • https://cdn.shopify.com/s/files/1/0440/3301/5958/files/5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/38659434623.pdf
    • https://cdn.shopify.com/s/files/1/0436/7994/0761/files/jazufebazewibe.pdf
    • https://cdn.shopify.com/s/files/1/0439/2560/2472/files/87701277023.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/betemefamixiku.pdf
    • https://cdn.shopify.com/s/files/1/0435/4444/5082/files/gofurovuvo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9178/7937/files/guvaxipakibidorebemoxafu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9352/3618/files/what_is_png_interlaced.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/
    • https://cdn.shopify.com/s/files

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f0b.bin
b6b45528d93fc2a22bae4bbf3c8ba09f62232aa8152010c07abbf62a34329875		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0B 5644 bytes
font_01_sfnt_off00007228.bin
997045edb8f9a2ce29aea3d22530e9db736b0187a14680c21572439c76cae8db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7228 12604 bytes

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