Malicious PDF — malware analysis report

Static analysis result for SHA-256 870daa388729b4f5…

MALICIOUS

PDF

44.3 KB Created: 2020-09-10 14:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 859a834ef6037d6ff26aef878f36bf58 SHA-1: faedb490284b1da5c8adf0cb7992767a076202d9 SHA-256: 870daa388729b4f5db9ba507d5f4d44710fb28209f57829d7f2cee7a8bfc3302
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a link farm, embedding numerous URLs that lead to potentially malicious redirectors and content. The heuristic firings indicate a deliberate attempt to create a link farm on disposable hosting, with one URL specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the embedded URLs, reinforcing the malicious intent.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/wix?keyword=franchising+journal+pdf
    • http://files.hdskiandmanagement.com/uploads/1/3/1/3/131379591/7935096.pdf
    • http://files.srmta-reginabranch.com/uploads/1/3/1/0/131071067/dasex_fasamazut_nixurejejerixa_befigekomabogi.pdf
    • http://dojejom.jasonwangdesign.com/uploads/1/3/1/6/131606539/2877906.pdf
    • http://files.leoclubofjuhu.com/uploads/1/3/1/6/131606393/2758751.pdf
    • http://dazisaper.fredamchaney.com/uploads/1/3/2/7/132712019/811d2a91479b.pdf
    • http://files.hunterachel.com/uploads/1/3/1/3/131382841/wuwevegetuvuresiguma.pdf
    • http://files.prospectartworks.com/uploads/1/3/0/8/130874125/vixebizugaxuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5658/5114/files/equidad_educativa_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0433/1533/1227/files/dopejitadepazixakudis.pdf
    • https://cdn.shopify.com/s/files/1/0447/3847/8229/files/zufalizubojele.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_off00006fec.bin
3a84b12526dcc33bab64559d5ff67dd8960e35e0266cf9dd462f5f5230448d2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FEC 5448 bytes
font_01_sfnt_off00008277.bin
05fd4b978b27b65f16545ed2d19a80f2ead659fcef2783e58e411f81975fbc5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8277 10084 bytes

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