Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab23e4b831e5190…

MALICIOUS

PDF

42.8 KB Created: 2020-09-17 13:39:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43502a3b0c736f5985dcebc1254c4379 SHA-1: 13398cb165a32890c5ed229de9050fc9ebc95090 SHA-256: 6ab23e4b831e5190e9353aef291e9fd50866d405bbcbddfb5c619c26970e8768
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector, suggesting a lure to external malicious 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.club/wix?keyword=whistling+tea+kettle+made+in+usa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://57a54672-755f-4d95-a2d6-c37c4584dead.filesusr.com/ugd/5a4aad_d96971bdf01943e5807fb388995f388a.pdf?index=true
    • https://ff262903-d921-4c59-8da6-a584c643c611.filesusr.com/ugd/f68081_d3a6f9b2fc46498c83c404fd2d03392d.pdf?index=true
    • https://6e1467ff-c039-442a-8d20-5516a7ac478d.filesusr.com/ugd/de3d83_18d590d69e184b29a71dabb0b47b6774.pdf?index=true
    • https://d207aaa7-4f7e-4ffe-a8cb-054e9e0239c6.filesusr.com/ugd/fc840b_4ba1e81ebb71425592c83228271b6a89.pdf?index=true
    • https://13a9eee8-a06c-4474-ab37-0ad5ad202ed0.filesusr.com/ugd/bba345_aef1ae9a44194917a8e8b434494c01b1.pdf?index=true
    • https://60845ed8-3f94-4529-b871-827017cbcb16.filesusr.com/ugd/1c90dc_5c1353cc4f354967bb4f844150dcd1f5.pdf?index=true
    • https://5d035c57-546f-433d-81cb-7c631516e42f.filesusr.com/ugd/384ea4_9682d6fc3f6647809f65b0c2323ebdfd.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/wesigot.pdf
    • https://cdn.shopify.com/s/files/1/0447/6325/0839/files/western_blotting_principle_and_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0481/5929/3607/files/morton_middle_school_phone_number.pdf
    • https://cdn.shopify.com/s/files/1/0439/3625/2072/files/logarithmic_inequalities_worksheet_with_answers.pdf
    • https://d16189e5-e032-4007-ba42-c1544519b47c.filesusr.com/ugd/84a5c6_0722718b5f704b12ae13fca1bffbed31.pdf?index=true
    • https://4687c739-6fdd-40e4-9506-4694b6e15ff9.filesusr.com/ugd/a91264_b1ec33e11b53434c92adef8aeeca57e7.pdf?index=true
    • https://19a599bc-018a-4953-b76f-78379a0c4a8e.filesusr.com/ugd/48f461_56863ea6b93a476e926b10742cdea509.pdf?index=true
    • https://9281b49d-9459-4c99-934d-fc3e48e53fd6.filesusr.com/ugd/d6b5da_a976de0569174db5a7351ff0950f81e6.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_off00006a15.bin
58d6e8d40376272f4b44239edd6ef0e9f45a4dd0d995eeec255d8ff4b3ff6d0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A15 5220 bytes
font_01_sfnt_off00007bbc.bin
ab4165065d136cf07f43e852daff46f33d5dc77919e11e29ca85919ad65cf2b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBC 10156 bytes

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