Malicious PDF — malware analysis report

Static analysis result for SHA-256 49da4101d8f7bcae…

MALICIOUS

PDF

43.9 KB Created: 2020-08-12 06:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf86ff660551bf295990181b752f234c SHA-1: 6dc33ce2521b1003bab8837697d4a7c5dac12b26 SHA-256: 49da4101d8f7bcae939bb9dccc1875cc5d44dc9e607239cb7db478a0a4f6f715
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting a lure for users to click on it. The presence of numerous other links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=cart%25C3%25A3o+cnpj+receita+federal+pdf
    • http://files.ilonaaltman.com/uploads/1/3/1/4/131406149/b4de5b.pdf
    • http://wireli.oldlakewoodshop.com/uploads/1/3/1/3/131384016/lonasadu.pdf
    • http://files.hayseedcafe.com/uploads/1/3/1/3/131379371/0a12d946e5d313.pdf
    • http://daxedo.elenakolotusha.com/uploads/1/3/1/4/131407164/vuwibulob.pdf
    • http://files.farmingdaleadultdaycare.org/uploads/1/3/0/9/130969885/8814582.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29883534071.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/wow_mage_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/20013485494.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5227/files/call_letter_for_interview_sample.pdf
    • https://cdn.shopify.com/s/files/1/0440/3511/3110/files/8712123445.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/51381297900.pdf
    • https://cdn.shopify.com/s/files/1/0429/3692/6374/files/60121633489.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/jinesusigifalaluk.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/descargar_cancionero_infantil.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/rich_dad_s_guide_to_investing.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e53.bin
09f1f3641fcbfdd57a80787ca50c8891cf6cddd296a10e43278e6427da86bebc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E53 5176 bytes
font_01_sfnt_off00006f6d.bin
b7f8ae8a90b0f17af3e9f909eba8c468e5e74081444616550b0dc8a740175012		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F6D 10260 bytes
font_02_sfnt_off0000929c.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x929C 4324 bytes

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