Malicious PDF — malware analysis report

Static analysis result for SHA-256 771e3801361433e7…

MALICIOUS

PDF

42.8 KB Created: 2020-08-09 20:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87dc1ad8a3b85c12e5196b29b540ca77 SHA-1: cf15e5361ba501dc92db0b06e8d31cc60e105c49 SHA-256: 771e3801361433e7a879309a3b333be2fe13ab07c62f4018bd605f254814186d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to external PDF files, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.com/pify?keyword=aria+bachianas+brasileiras+no+5+pdf'. This indicates the document's primary purpose is to redirect users to malicious sites, likely for further exploitation or phishing.

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=aria+bachianas+brasileiras+no+5+pdf
    • http://files.leonbergersofnorlil.net/uploads/1/3/0/7/130740553/9602180.pdf
    • http://files.ampgrp.org/uploads/1/3/2/6/132695244/jirilak.pdf
    • http://files.georgelibermanphotos.com/uploads/1/3/1/3/131378771/094302f.pdf
    • http://files.dragonflydayhomes.ca/uploads/1/3/0/7/130775503/162137.pdf
    • http://files.oakdaleediting.com/uploads/1/3/1/4/131437680/sugefew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5208/1053/files/bozodu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3309/9430/files/16189399010.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/80475535234.pdf
    • https://cdn.shopify.com/s/files/1/0435/6086/1845/files/the_complete_root_cellar_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/9156/6493/files/neverwinter_nights_2_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/19672510643.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/guerras_carlistas_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/sap_implementation_guide_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/80431162563.pdf
    • https://cdn.shopify.com/s/files/1/0433/1975/4907/files/71540641426.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78549170372.pdf
    • https://cdn.shopify.com/s/files/1/0431/1964/0738/files/82831919458.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/kejed.pdf
    • https://cdn.shopify.com/s/files/1/0428/9573/6988/files/resifutapazelamenomufafu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/technology_and_applications_of_autonomous_underwater_vehicles.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_off00006791.bin
58a7a18013080115b43a536f73a5811016ce8bb89029a44784f85b5751730ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6791 5496 bytes
font_01_sfnt_off00007a38.bin
f5f65adf647bfea18b3b4d0d46bf7a6550b476403379f10d0073c48d298637fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A38 10420 bytes

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