Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc8755a23d83769…

MALICIOUS

PDF

56.7 KB Created: 2020-10-16 16:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bfded544a83b78cddf37bad336ac1fb SHA-1: 44356f13054cac96ed723f4cadcc20d160823481 SHA-256: 0dc8755a23d83769791c0bd42102001f8fd6181cf40140a4a5b2789fdfd54ddf
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, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that is also flagged as a redirector. The ML classifier strongly supports the malicious verdict, suggesting the primary goal is to lead the user to a harmful site.

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/123?keyword=digital+integrated+circuits+second+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f897e5fc3afe.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/xenemavurinap_jokepirewiteda_fijalezej_gemewije.pdf
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/91bff.pdf
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/faropufopogugojupot.pdf
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/4416131.pdf
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/aa94aa7f99c.pdf
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f891aa57c4f5.pdf
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f871099a1682.pdf
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f89597196730.pdf
    • https://cdn-cms.f-static.net/uploads/4369663/normal_5f89379e88391.pdf
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f8773f2cbbe3.pdf
    • https://podesasi.weebly.com/uploads/1/3/1/4/131437149/0b9877ec.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/munenupowubib.pdf
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/miranajegav.pdf
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/1cf22.pdf
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/5938510.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/533671f9-f489-43e1-ad45-f43d9054463e/18281729545.pdf
    • https://uploads.strikinglycdn.com/files/284c3755-df94-4821-adc7-2266ef9fdac0/78099731135.pdf
    • https://uploads.strikinglycdn.com/files/e48df860-59d0-472e-b43c-3b729cf4de4c/vemanigiruziwenewuxu.pdf
    • https://uploads.strikinglycdn.com/files/f65d58e9-0708-4b7c-8783-e11a55bcb76a/43029193298.pdf
    • https://uploads.strikinglycdn.com/files/8d9a2e11-107f-44c9-ba74-71da5e912e90/galerodagudinibonejine.pdf
    • https://uploads.strikinglycdn.com/files/8db3150a-865a-45a6-97e9-a580a4614e05/97963216068.pdf
    • https://uploads.strikinglycdn.com/files/4c6dbcfb-0655-47e3-ac89-80c77ec9e19d/75065060959.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_off00009440.bin
59667894975eb5c29d428443fbccedd6e74275b795d39f0edcaaeff01843206a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9440 5320 bytes
font_01_sfnt_off0000a669.bin
32a9ed0e4d3e3307d6c78db6dc16e6f1294f98c2c7a7926282c825b613529a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA669 15128 bytes

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