Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecce9186527b478…

MALICIOUS

PDF

115.1 KB Created: 2020-03-30 14:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cce00e331642db1e55d45bcf7750a4bb SHA-1: 2f08dff1e6213d7a0a05c76f5c622bba0f3f39e1 SHA-256: 3ecce9186527b47881cd7b8c7f53f3ee0bfcaf52862240826fe89c2dd7d6107e
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though heavily obfuscated, contains a URL that matches one of the extracted external links. This suggests the primary purpose is to redirect users to potentially malicious content hosted on these external sites, likely as part of a link farm or SEO spam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://thehappygirlstore.com/uploads/1/3/0/6/130620372/130620372.html#tejido+nervioso+histologia+mapa+conceptual
    • http://remote-con.com/uploads/1/3/0/4/130489297/67520ec241e.pdf
    • http://jobperformancepredictorsllc.com/uploads/1/3/1/0/131070376/mibif.pdf
    • http://jesuscrisis.net/uploads/1/3/0/2/130289354/f3a67150.pdf
    • http://thespeckledbird.com/uploads/1/3/0/9/130969375/4c9fe15f.pdf
    • http://taketheleaddogwalking.com/uploads/1/3/0/6/130639609/nepopotidibikamiwex.pdf
    • http://westbranch.us/uploads/1/3/0/8/130874246/2a85b07c806e.pdf
    • http://dev.infratherm.com.au/uploads/1/3/0/6/130620874/tigonupegigar.pdf
    • http://hostmaster.sahgb.org.uk/uploads/1/3/1/1/131164251/7614839.pdf
    • http://wilmingtonncmarine.com/uploads/1/3/0/3/130379462/2151754.pdf
    • http://mbgeodezie.com/uploads/1/3/0/3/130323998/debolepakinufap.pdf
    • http://verandamarketonline.com/uploads/1/3/0/2/130289765/purogodibugega.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000187b7.bin
05d6ba559bf5ca23c003b42f6bebe634c608a6ea2d48470df0033855e92a4a5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187B7 9564 bytes
font_01_sfnt_off0001a9fa.bin
9d429dbece8d08ec595a91ed96f9a29f7101465a11ba2e97aa8138b1adb5ba85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9FA 16172 bytes

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