Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea77c3749494c120…

MALICIOUS

PDF

48.7 KB Created: 2020-04-10 11:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0ba2d53df8c044f64781853b72704dda SHA-1: 2db9c0d044e999fcfce86786b19e00fed8f02527 SHA-256: ea77c3749494c1207d225efdacba4a3ced373a4b075237389afcdc74871c95d7
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by an ML classifier with high confidence. Static analysis revealed it contains a large number of external links, a technique often used for SEO poisoning or redirecting users to malicious sites. The document body, though heavily obfuscated, contains references to the URLs found in the heuristics, confirming their presence within the document's content. No scripts were extracted, limiting the analysis to the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://shiying-cheng.com/uploads/1/3/0/6/130604860/130604860.html#john+dewey+charter+school+green+bay
    • http://traphippies.com/uploads/1/3/0/7/130739366/nazer.pdf
    • http://lymphandskincaresolutions.com/uploads/1/3/0/6/130640102/cdf5afe3d61.pdf
    • http://polycustomsautos.com/uploads/1/3/0/7/130738885/wifokodil.pdf
    • http://southamptonteachers.com/uploads/1/3/0/4/130477414/dovofiwaxig.pdf
    • http://italoservice.com/uploads/1/3/0/7/130738863/875ba9342dc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076c6.bin
80f914356324d54310812b316d7cb0f84dfda06071e2f6f761ad6db49418f149		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C6 8488 bytes
font_01_sfnt_off00009790.bin
2c32c498f23db3cae400dac070c72b38d41a5d5dbe5041cbe08e7cee44e1acfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9790 2648 bytes
font_02_sfnt_off0000a0e0.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0E0 16036 bytes

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