Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be28b3546eab46e…

MALICIOUS

PDF

46.6 KB Created: 2020-07-31 01:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdafdaff26a4c87ba2a8303b07173b81 SHA-1: 5efba8032c25b328c32aff7ff740025085c314be SHA-256: 6be28b3546eab46e800dd3a5873747bf304f04cd6516136b0ad96c79eaa9b740
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. 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=authentication+and+authorization+controls+pdf
    • http://files.authorerikamszabo.com/uploads/1/3/1/4/131437626/1396871.pdf
    • http://files.bgpianostudio.com/uploads/1/3/1/8/131872286/3de23abf08e.pdf
    • http://files.headstockofwoodstock.com/uploads/1/3/1/6/131606289/5099590.pdf
    • http://files.stnp2036.org/uploads/1/3/1/3/131383934/8591189.pdf
    • http://files.jenchristmanproductions.com/uploads/1/3/0/8/130813364/8932988.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/vebijidawivojuli.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2922/files/97129078995.pdf
    • https://cdn.shopify.com/s/files/1/0429/6628/6490/files/86857216997.pdf
    • https://cdn.shopify.com/s/files/1/0433/3666/3208/files/jugabamepasafotezezusuvu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7410/8057/files/sonesafubapupopo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3842/5767/files/87864911102.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/dudosalomozobegun.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/76082407622.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4267/files/95017767649.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/mifiladikun.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/91014809482.pdf
    • https://cdn.shopify.com/s/files/1/0435/7731/1395/files/58296105668.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/xonokibep.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000774a.bin
b46dab5f2517ccce22e05190b84e8bafbb44a637f015dcba5d9fc5fafd3a41e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x774A 5164 bytes
font_01_sfnt_off000088cf.bin
ddc816a6898739cd51a814e1740c8c6b3449072920e2f15db74c8ad75c3fffca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88CF 10440 bytes

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