Malicious PDF — malware analysis report

Static analysis result for SHA-256 c37fe1d882ffe664…

MALICIOUS

PDF

42.7 KB Created: 2020-08-07 13:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2f69c1e294ece1f237084f0bd13237 SHA-1: 29aab1cfe0e25fbf648c7d5f77067a7237dc5fde SHA-256: c37fe1d882ffe6647dfcc62183914f3995dab6680d274498fe82a4ae75f7d1ce
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, designed to obscure the ultimate destination. One critical heuristic identified a link to a known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the text 'Number coloring worksheets for kindergarten pdf' and a URL that appears to be the initial lure. The primary attack pattern involves redirecting users to malicious sites through a link farm.

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=number+coloring+worksheets+for+kindergarten+pdf
    • http://files.nolimitcombatives.com/uploads/1/3/1/4/131482926/a658b8e.pdf
    • http://kareravox.batsonhouse-salcombe.com/uploads/1/3/1/3/131398560/dipijabozar.pdf
    • http://files.banksfamily2017.com/uploads/1/3/2/7/132712129/4892911.pdf
    • http://files.theskinpod.co.uk/uploads/1/3/0/8/130874110/wokiduwitub.pdf
    • http://files.cabsmatters.com/uploads/1/3/1/3/131383575/puvudun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/98495210985.pdf
    • https://cdn.shopify.com/s/files/1/0433/2496/5019/files/jeravimimipiz.pdf
    • https://cdn.shopify.com/s/files/1/0427/8022/9791/files/figifelexifinujunoxekif.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/how_to_split_in_after_effects.pdf
    • https://cdn.shopify.com/s/files/1/0430/6970/2306/files/97000530853.pdf
    • https://cdn.shopify.com/s/files/1/0431/6977/5782/files/telebevirosalanidirep.pdf
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/xezuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8705/3471/files/goverabidejobod.pdf
    • https://cdn.shopify.com/s/files/1/0432/5087/6578/files/english_arabic_medical_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0434/6776/7970/files/xurinot.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_off000067bc.bin
da7d060fa3cd2c877aab69340b5ad701d920a8c1c24a6f70ae7e1967e5685eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67BC 5836 bytes
font_01_sfnt_off00007b82.bin
0ef9658c26e1380e442a798c2c33c892c3b60c67724e875a8ca8cf24c1639730		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B82 9936 bytes

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