Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a7aeee73cd45b0…

MALICIOUS

PDF

34.8 KB Created: 2020-10-15 12:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 26e41c80c0e9d62ce6428f3203c43eb4 SHA-1: f1b4eaa4df0d9968615051e052f6c57dcfe5e10b SHA-256: b3a7aeee73cd45b035813373df5c690b697919bb153de05b1fcb5a633207c9b4
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and a known malicious redirector. The primary URL, https://cctraff.ru/strik?keyword=java+programming+pdf+balaguruswamy, is identified as a malicious redirector, suggesting the document's purpose is to lure users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=java+programming+pdf+balaguruswamy In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367646/normal_5f874b3d48dc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f87c71567ec1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f8748b8b9710.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368485/normal_5f87a7151ecee.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/batagebexi.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/bfcfaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366964/normal_5f8782c95d689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_5f87042be6661.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f87b14cc25ce.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/jogowezokuvaxu.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/a9ba43d719.pdfIn PDF document text
    • https://site-1048194.mozfiles.com/files/1048194/xiwanifesofitajojeveg.pdfIn PDF document text
    • https://site-1043153.mozfiles.com/files/1043153/wimajefojeguvenonorudozi.pdfIn PDF document text
    • https://site-1048215.mozfiles.com/files/1048215/5848994608.pdfIn PDF document text
    • https://site-1039140.mozfiles.com/files/1039140/48794903576.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4750/8385/files/arduino_sensor_shield_v5_0_schematic.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7036/0225/files/fur_real_cat_with_leash.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3648/7061/files/ashrae_handbook_fundamentals.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3507/4465/files/ways_to_open_iron_doors_minecraft.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000048ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48CE 5744 bytes
SHA-256: 72b8495c351daeecd98c083a518a7f18722f68b63270a493795bcc83f46f7ec8
font_01_sfnt_off00005c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C50 9756 bytes
SHA-256: 028a3c567d5a2aa25f78bc5e8d28770056c0f3a6d154bc7491109ab83732cdf1

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