Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f2418083780b88…

MALICIOUS

PDF

49.8 KB Created: 2020-08-09 10:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f8bb6e83d6c667f16c42a43db935ebf SHA-1: 830cc18040f79bda0044ef731c150717b381ffe7 SHA-256: 79f2418083780b884cfa50434036b3f320b9b0196e95b45cf6428b0e91303ed3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are to Shopify domains, suggesting a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify. The document body, though heavily obfuscated, contains the target URL, indicating a lure to a potentially malicious site. No scripts were extracted, but the presence of numerous links and the ML classifier's high confidence suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=world+map+outline+with+countries+pdf
    • http://files.misssantafe.org/uploads/1/3/1/3/131398406/ribudafov.pdf
    • http://files.krystianalisha.com/uploads/1/3/2/3/132303035/3643002.pdf
    • http://ridik.spinnakerworldwide.com/uploads/1/3/0/9/130969426/6240122.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7421/5331/files/buwopazugez.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/44147301691.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/lafumamisabigal.pdf
    • https://cdn.shopify.com/s/files/1/0440/3236/0613/files/fufilukizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/kivibiwepitekudoli.pdf
    • https://cdn.shopify.com/s/files/1/0435/7783/5681/files/45816226600.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/komimawa.pdf
    • https://cdn.shopify.com/s/files/1/0434/2077/8653/files/3360398101.pdf
    • https://cdn.shopify.com/s/files/1/0437/1320/0282/files/georgia_bill_of_sale.pdf
    • https://cdn.shopify.com/s/files/1/0437/5642/1278/files/30741323512.pdf
    • https://cdn.shopify.com/s/files/1/0435/8383/2227/files/asc_606_revenue_recognition.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5316/files/gamajagogomusonima.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/jelubusiwavalelakoko.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3270/files/placenta_previa_ultrasound.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008336.bin
5fd7674df1f26228fa3e1de4c987192ea3a2755224a7560ea64538f69860494b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8336 5500 bytes
font_01_sfnt_off000095d5.bin
4f53fc275b097536f32a5c0da965e5b759d89f9e9849d185dd11c53315fd38a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D5 10652 bytes

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