Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8226233e287997…

MALICIOUS

PDF

38.5 KB Created: 2020-10-09 04:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cde6489490e9f3e6a49b6d9f3b478c75 SHA-1: 320f8c898ce34b8169e82fe17fcdbb99b1d62efa SHA-256: cd8226233e287997aa37cf418ac60e08778524d1596011d3279562db1100e8a9
124 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a URL associated with malicious redirector infrastructure, specifically targeting a search term for 'tunein radio pro apk download'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into downloading potentially harmful software. The ML classifier strongly indicated maliciousness, and the presence of multiple links on disposable hosting further supports a malicious intent.

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 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://ggtraff.ru/strik?keyword=tunein+radio+pro+apk+download In PDF document text
    • https://site-1043408.mozfiles.com/files/1043408/7584610708.pdfIn PDF document text
    • https://site-1040427.mozfiles.com/files/1040427/kepogarepix.pdfIn PDF document text
    • https://site-1036791.mozfiles.com/files/1036791/sowepafabitagu.pdfIn PDF document text
    • http://naxoke.designsbyjakej.com/uploads/1/3/2/7/132741508/7232928.pdfIn PDF document text
    • http://files.heavensgardenrestored.com/uploads/1/3/0/9/130969129/7444924.pdfIn PDF document text
    • http://files.longford.coralleisure.ie/uploads/1/3/0/7/130739258/tafutol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f28cc7ca-58c4-4592-a4d4-1bc1439fcd00/kotelege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c4c1f65-1117-43fa-9fbb-ce4c439b28bc/malesox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0848425e-a293-4093-b91b-04fb81d158c7/73828505387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83b1176-3765-4dfa-8128-6433560bfc1d/dowaduvijibobaje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae6d0d6e-ddc3-4577-bdc8-3c045ef22ed7/11679279546.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/nutribullet_gasket_ring.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6596/9314/files/fluvanna_county_high_school_number.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_off00005659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5659 4880 bytes
SHA-256: 90a7d2990f82cfe59e79f0762ce9035063d8fff34b907121020a6930e608023a
font_01_sfnt_off00006712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6712 10640 bytes
SHA-256: 075eaf3c9019edd6dc687578adba4e2f53d4adbc94939caa9e2adbccf547eb11

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