Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a949633b9213f4…

MALICIOUS

PDF

43.4 KB Created: 2020-08-30 16:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07ffd8201a024fdf33eb96d53494d6d8 SHA-1: 509ee802ebd71f74461ea3fe3514687b89bf41c9 SHA-256: b0a949633b9213f4cc691d0840e970bc24109f1a50d15ba2b352d83f626aedd7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a mass external PDF link farm. One of these links, https://ttraff.me/wix?keyword=words+per+minute+by+grade+level, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, reinforcing the link-based attack pattern.

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.me/wix?keyword=words+per+minute+by+grade+level
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • https://cdn.shopify.com/s/files/1/0434/6865/2697/files/eenadu_telugu_news_paper_today_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3667/files/government_grants_act_1895.pdf
    • https://cdn.shopify.com/s/files/1/0434/3067/4597/files/428547325.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2518/files/maramigurulalixumen.pdf
    • https://cdn.shopify.com/s/files/1/0437/0622/0697/files/historical_geology_lab_manual_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/6269/7894/files/linkedin_profile_image.pdf
    • https://cdn.shopify.com/s/files/1/0433/7549/3271/files/93052287315.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/credco_instant_merge_credit_report_sample.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2138/files/vuzunulukewavuzusofutewod.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/adventurers_league_dm_log_sheet.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c007da6a7b64c88bcc7eec1e8e10446.pdf
    • https://static.usrfiles.com/ugd/760101_d423fdeb4f8a48b8ac9421624f59b345.pdf
    • https://static.usrfiles.com/ugd/7f16bd_7bf0b990688d4586b32e2fd8dd418e17.pdf
    • https://static.usrfiles.com/ugd/3e5d97_02d7a70133204bcf8058f46570d7d80a.pdf
    • https://static.usrfiles.com/ugd/b8c837_f5b1d4ade9bb4405915c7c4c70ea93ad.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006bd5.bin
65dda6c77f6a740201b6372fc2f5f1895355bbfc40be2eae0381f9fc6200d389		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD5 5592 bytes
font_01_sfnt_off00007ed5.bin
250bf6231d0106743251e30d9fdbe72919de48976e3bb9137315c5728b75c72d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED5 9980 bytes

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