Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f5c15c73757e0a…

MALICIOUS

PDF

52.9 KB Created: 2020-08-12 09:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4dfa447e92648402c5102b08bb94cca9 SHA-1: 017ac7b0a778753af1f361a0005b1a3aa6370352 SHA-256: 82f5c15c73757e0a8a636123758437781a841a9ec7d4d463a916671b85d48626
162 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The 'ML_NYX_PDF_MALICIOUS' heuristic also strongly indicates malicious intent. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.ru/wb?keyword=pdf%20to%20jpg%20hq
    • http://files.oestore.shop/uploads/1/3/1/4/131453213/soguvigapoxod.pdf
    • http://files.adrianamedinacagan.com/uploads/1/3/1/6/131607054/522351.pdf
    • http://files.dcmspto.org/uploads/1/3/0/7/130739128/9199250.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2504/6431/files/learning_management_system_research_papers.pdf
    • https://cdn.shopify.com/s/files/1/0439/5096/4904/files/zopetipavolujoxusobasiw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6217/3604/files/dilurasup.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/life_skills_counseling.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3791/files/allons_y_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/9432/6939/files/nudejomudidoso.pdf
    • https://cdn.shopify.com/s/files/1/0433/3263/2730/files/68605688699.pdf
    • https://cdn.shopify.com/s/files/1/0432/6280/4136/files/gitakikotupopivejalire.pdf
    • https://cdn.shopify.com/s/files/1/0428/6113/3990/files/la_couture_pratique_burda_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0439/4919/5419/files/aisc_manual_of_steel_construction.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_off00008c59.bin
53d5525caa6f9b46de57847e46d4da4f33711c3407aa94db0854e27a73044ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C59 4988 bytes
font_01_sfnt_off00009d57.bin
e3ab5f58354165e88da991a7db7cd8c04723410b22f6817c349933e1550f0af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D57 13008 bytes

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