Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3ee713248214da…

MALICIOUS

PDF

52.1 KB Created: 2020-08-03 16:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 925ee30021efa2e574f4ed416f97082a SHA-1: 7bafaf14144d61a752484c907310cb2f93da9815 SHA-256: 5a3ee713248214da1afafe2ccf7f7541acb8bb3c25e6d0cfc99a8d26fbfba97b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains references to the malicious URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=brucellose+physiopathologie+pdf
    • http://files.phonomenon.net/uploads/1/3/0/7/130775776/jovesilojixakin-zuxir-mirivilarawapig.pdf
    • http://files.dia-healthcare.com/uploads/1/3/1/3/131380467/kitokanuzogolof.pdf
    • http://files.mysoapkrush.com/uploads/1/3/1/4/131408103/keduwup.pdf
    • http://files.hacklebarneyfarm.com/uploads/1/3/2/6/132695832/tuwizid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/76225699548.pdf
    • https://cdn.shopify.com/s/files/1/0429/1382/4927/files/35260805866.pdf
    • https://cdn.shopify.com/s/files/1/0428/0093/9164/files/48833918295.pdf
    • https://cdn.shopify.com/s/files/1/0427/5830/8006/files/27108500977.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/60907796384.pdf
    • https://cdn.shopify.com/s/files/1/0440/2829/7381/files/84122369385.pdf
    • https://cdn.shopify.com/s/files/1/0431/5316/2394/files/relamikozasoko.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6315/files/ladum.pdf
    • https://cdn.shopify.com/s/files/1/0445/6477/5076/files/hindu_bible_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/migrate_minecraft_account.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2376/files/48780543700.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1395/files/bite_down_sekiro.pdf
    • https://cdn.shopify.com/s/files/1/0440/1269/9798/files/gifuropawuvo.pdf
    • https://cdn.shopify.com/s/files/1/0439/8622/3262/files/rerotuzalaxo.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_off00007fe3.bin
74c13adcda52f0b6702b57b5c264b9676c13f2413677450f8bfe02aacaa99880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE3 5568 bytes
font_01_sfnt_off000092d8.bin
7ee48e4f4b479f94e03085ec205a0464cbc53990f6119f46df6cc04503781968		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92D8 15244 bytes

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