Malicious PDF — malware analysis report

Static analysis result for SHA-256 6735bae252c9193a…

MALICIOUS

PDF

41.7 KB Created: 2020-08-10 16:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ba51bc54282c61930b279a6085c3dc SHA-1: faadbcd31e7c9c88a2955963cc1f47c6be906386 SHA-256: 6735bae252c9193ad8324c6bbee7de0e680989c18ea33fce339ab59c1bacb0cc
154 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 SEO-optimized and point to PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same redirector URL, indicating its likely purpose is to drive traffic to malicious sites. No scripts were extracted, but the presence of numerous links and the redirector heuristic strongly suggest a phishing or malware distribution lure.

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.cc/pify?keyword=barman+in+red+libro+pdf+descargar+gratis
    • http://files.greenremediesnj.net/uploads/1/3/1/4/131483492/e527756672efea.pdf
    • http://rakimigej.karapaints.com/uploads/1/3/1/6/131606289/pefesatuxis.pdf
    • http://fisoxisap.kidfoodiecolumbus.com/uploads/1/3/2/6/132682076/5080525.pdf
    • http://files.jacobwetterlingfilm.com/uploads/1/3/2/7/132740982/dbfa18218.pdf
    • http://files.kimanidolls.com/uploads/1/3/0/9/130969158/vunewifar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/5549/4806/files/prentice_hall_chemistry_workbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/6251/0236/files/vadisamok.pdf
    • https://cdn.shopify.com/s/files/1/0429/9168/1699/files/fuzulivazagajel.pdf
    • https://cdn.shopify.com/s/files/1/0432/6244/3683/files/85157757749.pdf
    • https://cdn.shopify.com/s/files/1/0428/9137/8854/files/finozugitipifigaraweluwi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1450/4093/files/72518973881.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/jowurogajelidega.pdf
    • https://cdn.shopify.com/s/files/1/0432/5684/0354/files/convert_from_to_word_arabic_language_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2190/files/doxalakusoxoweka.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/sisawixilunuwekesugeso.pdf
    • https://cdn.shopify.com/s/files/1/0431/6374/6465/files/66622406360.pdf
    • https://cdn.shopify.com/s/files/1/0448/3982/9661/files/interior_design_for_small_house.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2421/files/minecraft_giant_oak_tree.pdf
    • https://cdn.shopify.com/s/files/1/0433/5573/4166/files/88120296408.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_off0000640b.bin
3e535c0c2371de574088defdebdbfa6abbd6d9f1e236b94ed7e5208d607ea537		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640B 5664 bytes
font_01_sfnt_off0000772c.bin
d7ccd8b58682330560a23a04369ef7b641c91a1a76257895569c0f7a68f1ae8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772C 10244 bytes

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