Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b806dbe4d0510a0…

MALICIOUS

PDF

45.7 KB Created: 2020-08-17 00:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06879868d7a52a2da58532eab9b9e2c1 SHA-1: 608721dbe247a19ee87f0ee41d07eed5bbf3d4f3 SHA-256: 5b806dbe4d0510a037277cbb35ba8a710d7b0348cf18f5ead014632a1203e6ba
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=japanese+encephalitis+vaccine+patient+information+leaflet'. The document body, though heavily obfuscated, also contains this URL and many other PDF links, suggesting a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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=japanese+encephalitis+vaccine+patient+information+leaflet
    • http://files.lovebugweddingcars.co.uk/uploads/1/3/2/3/132303068/6245822.pdf
    • http://files.carpetcleanoahu.com/uploads/1/3/1/3/131383602/zefot_tujopopafodaja_kojubutujara_xapesiwuka.pdf
    • http://wuteza.roverchaseacademy.com/uploads/1/3/2/8/132815176/5127016.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/3778/6266/files/gujarati_barakhadi_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/virotugenipafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaled.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/firix.pdf
    • https://cdn.shopify.com/s/files/1/0436/4645/1862/files/225917544.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1642/files/68607117239.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/negusonefurukiwaseduv.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/impulse_control_activities_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/somufedigok.pdf
    • https://cdn.shopify.com/s/files/1/0440/6404/7254/files/steuererklrung_2020_formular_anlage_av_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0541/files/assertiveness_skills_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/60380297138.pdf
    • https://cdn.shopify.com/s/files/1/0434/0793/3603/files/accounting_and_finance_cv_examples.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/jufufexakux.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006769.bin
790a3d6bf69c7f26f1cc00613e8e8b037f1912da7c8504a5b5bbcd594fd83a20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6769 5092 bytes
font_01_sfnt_off0000787f.bin
7a919ee53f4541b20add6176d6e14a07d0681252ca6ec4bedb252fa8ff376608		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787F 10144 bytes
font_02_sfnt_off00009b24.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B24 4324 bytes

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