Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a823c0b5ccf17dd…

MALICIOUS

PDF

43.1 KB Created: 2020-09-19 12:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4485ae07ba0fc943e98c6910dbdf9336 SHA-1: 1ac13704e527b7eb2d661efee2075fc54c71e875 SHA-256: 6a823c0b5ccf17dd4042147519f6200d9168fddd3770b3c3470258d5e6ff9867
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as an employee handbook, which is a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm designed to obscure the true destination. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

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.link/wix?keyword=toys+r+us+employee+handbook
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://49055a56-3b9e-40a0-872a-f30161a56397.filesusr.com/ugd/a43ec6_4400e83b5a744168bcd586bb9bca3485.pdf?index=true
    • https://f7a7c0aa-c372-4232-ae52-7b3fdfb77e20.filesusr.com/ugd/baa514_68e013d847c6488288f8f96182276c44.pdf?index=true
    • https://1aeeca40-6dbc-4756-be49-51db3f73378f.filesusr.com/ugd/ee6100_6c54cff78f9a4b489b1c23b1c7c80abb.pdf?index=true
    • https://1e926fce-a915-4b1a-a30e-de71cda214a0.filesusr.com/ugd/bf650e_d9659eed390a422680c99bcf0e1dd8b4.pdf?index=true
    • https://440c86f2-eb98-4b5e-8456-f40cc29e85df.filesusr.com/ugd/bbd3cf_bef38677ae9a41a48c896e8a08334a0c.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/gulosewukaju.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/humraaz_songs_mr_jatt.pdf
    • https://8d595d12-1471-4c2a-b42f-15b91adf5574.filesusr.com/ugd/0a593f_bba797daff584686a70fe7d0a644a301.pdf?index=true
    • https://bbdd001d-2a11-4d82-bbf7-5e4c305825bc.filesusr.com/ugd/ede58b_ac678f70c98b4294a2e8018fd3c4fea1.pdf?index=true
    • https://848d01a7-9299-4723-bbbc-7c5b08bc5005.filesusr.com/ugd/3f2390_0c2424440bf34c2a8fd4bc5f9a9c4d2f.pdf?index=true
    • https://5c8a805f-a7fc-4531-a68a-b8ecc52179c6.filesusr.com/ugd/8d5d69_3a2488f9f4334a7984aec260ee03009b.pdf?index=true
    • https://c32a2725-e341-4493-9574-c121c726744e.filesusr.com/ugd/02631b_a984cc0ae3b74ff1a2aed16dcff579e1.pdf?index=true
    • 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_off000069e7.bin
b7fa643df50b8f001dd696588e3ef9dd2eb9c97bfc1f299842cc8d20156b080b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69E7 5452 bytes
font_01_sfnt_off00007c44.bin
2489d75a226553b410b43e1ed3fe0bfb329cbd7486950ad9f5f4266412732af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C44 10336 bytes

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