Malicious PDF — malware analysis report

Static analysis result for SHA-256 8084e0f510b5a971…

MALICIOUS

PDF

48.4 KB Created: 2020-09-22 05:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76f3aa4ea7c0f4b399a8f9125535875e SHA-1: 7dc82e7cbaa749c7cf5e1dfe44d46f952113fe7f SHA-256: 8084e0f510b5a9716fd3c2ae0a55893971d2e72e20204992667c13f9d138537f
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that points to this malicious redirector. This suggests the document is designed to trick users into visiting malicious sites, likely for further exploitation or phishing. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=exponent+puzzle+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://19d1f5a9-b5bb-43a6-bf15-d9787bf58cff.filesusr.com/ugd/89064d_6c84d69e0dbf4b0ca476f5720773e15f.pdf?index=true
    • https://5fe36d8f-f917-4a3f-ae60-3febcb691bcd.filesusr.com/ugd/510691_07c36b76bd4048ee855e554f9400e738.pdf?index=true
    • https://557f08b6-63c9-4d49-8de8-374c73259b6f.filesusr.com/ugd/34e21e_deace97c0f4f4e668909271accbf3e22.pdf?index=true
    • https://ba00fe0e-2a27-4f3e-b447-66c87761876e.filesusr.com/ugd/f1c748_21d2641ded4a48e58f7563935b201b9f.pdf?index=true
    • https://ab47ca62-63bf-462e-862e-e5953057d50c.filesusr.com/ugd/df73ab_95d7807608824290bc8c354b5c73012c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0465/5546/3830/files/e20_heat_load_calculation_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/4832/1702/files/40712780224.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/47740406541.pdf
    • https://cdn.shopify.com/s/files/1/0440/4333/7878/files/crystal_geyser_alpine_spring_water_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/3620/5479/files/vanilla_javascript_vs_jquery_performance.pdf
    • https://cdn.shopify.com/s/files/1/0483/1602/2948/files/71284536904.pdf
    • https://d88964a4-97fe-4d05-bf3d-1d9387191628.filesusr.com/ugd/cc3ca9_3be8ea8063004740b053f4fe04cdec83.pdf?index=true
    • https://e93a3e60-4ec6-47a1-bf11-59727221afd8.filesusr.com/ugd/ede58b_a28b260a6f9a47c8a8dcae5952bd1eb5.pdf?index=true
    • https://eb6beccf-8a14-4919-ab01-b6ba70915174.filesusr.com/ugd/6f7357_01a28aadd76c423f804e3a1097dd91b9.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077d3.bin
05a7a665039835b4c4441d8beee2056cdd37d45e07ac150dfabce3301130a1c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D3 4928 bytes
font_01_sfnt_off000088ae.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88AE 1800 bytes
font_02_sfnt_off0000913b.bin
660b769d47e6e75e2a40fe9fd38abcc35860b7a8cbef05d5833f211eeeb56d24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x913B 10720 bytes

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