Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cb75e8cdfbe040…

MALICIOUS

PDF

48.5 KB Created: 2020-08-14 12:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f8b6d8cfc3e1b270b6d1a6bc3253dea SHA-1: aa2b17c9981cd193f448a438ee50a418b884246a SHA-256: 15cb75e8cdfbe040b8e2b9d68c4029a736c32a5176224ed559a1cf7ba5c264e3
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at `ttraff.com`. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the presence of 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.com/wb?keyword=el%20anillo%20del%20nibelungo%20wagner%20pdf
    • http://files.tinagutierrezartsphotography.com/uploads/1/3/0/7/130775383/remax-taxopugazaledu-fuluxibejurifuj-lavosiraleset.pdf
    • http://files.lincolncollegechapelchoir.com/uploads/1/3/1/4/131409526/9547076.pdf
    • http://botenibaz.mamss.org/uploads/1/3/1/1/131164250/1028684.pdf
    • http://fofedizas.birdsontheniagara.org/uploads/1/3/1/0/131070858/5119794e7c.pdf
    • http://najuto.5-s-poodles.com/uploads/1/3/1/4/131483337/6899735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1741436775.pdf
    • https://cdn.shopify.com/s/files/1/0435/8488/0798/files/breville_toaster_oven_bov800xl_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/rutotagofoturojukigokedoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/4012/9692/files/kenop.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/39337819594.pdf
    • https://cdn.shopify.com/s/files/1/0448/9910/6983/files/43821169418.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/40427569466.pdf
    • https://cdn.shopify.com/s/files/1/0431/7665/7051/files/classical_apologetics.pdf
    • https://cdn.shopify.com/s/files/1/0431/4149/6986/files/52481743108.pdf
    • https://cdn.shopify.com/s/files/1/0435/4031/6311/files/10845392937.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/sobufiv.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000710e.bin
d7b1bc3c0ccb5a37a5c5ea4216d88771814a10aa13b1c4e8e7a3b0907df9117c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710E 5020 bytes
font_01_sfnt_off00008233.bin
758be5f342cb3278c8e1b56fb5aa1f19253940162e18b8178639695bea22d9f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8233 10708 bytes
font_02_sfnt_off0000a536.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA536 4324 bytes

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