Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db4fe3616c2a0a8…

MALICIOUS

PDF

56.0 KB Created: 2020-07-31 08:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cd0f32772d1f76bc8766318c1d848f0 SHA-1: 8c4fdb2fecea03796fbdd7cd7b1b19fc865461cc SHA-256: 5db4fe3616c2a0a8afa1ea2e01b18c50ec90172e35361dd69d0dcf3e1e6c24ca
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute content through a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be a precursor to a password-protected archive, often used to bypass security scanners. While no scripts were extracted, the embedded links and heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=concepto+de+aprendizaje+basado+en+problemas+pdf
    • http://files.karenjuneau.com/uploads/1/3/1/8/131856160/nuludikim.pdf
    • http://files.thebotanyscholar.com/uploads/1/3/0/7/130775384/e86badbf2.pdf
    • http://files.farmarcadia.com/uploads/1/3/0/9/130969242/dotasuwora_dazikuna_foxesajezasowa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5874/8837/files/povopuzoxupubije.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/5393570033.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1111/files/33934489068.pdf
    • https://cdn.shopify.com/s/files/1/0433/0727/0297/files/zulerejilajamibo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0994/7301/files/detalunibemav.pdf
    • https://cdn.shopify.com/s/files/1/0432/6778/4864/files/suwozotajilafe.pdf
    • https://cdn.shopify.com/s/files/1/0437/0015/8629/files/23458316630.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2039/files/vizowurapogimijekapi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3095/3627/files/64485598222.pdf
    • https://cdn.shopify.com/s/files/1/0433/5383/3637/files/ravunobabodu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7354/5116/files/pevug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4162/8072/files/muforamuna.pdf
    • https://cdn.shopify.com/s/files/1/0432/8872/3616/files/notifoxopog.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_off00009998.bin
9979c2c4b892d2f700044aea3437b53e4bb9b5a456a0d0e6ff1756524f6818e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9998 5380 bytes
font_01_sfnt_off0000abc4.bin
f4ee582790dadd1b014b954114adf01612fa4e1d65f25f4c3d3e4aa3c309fe3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC4 11492 bytes

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