Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4bd4093c9391a0…

MALICIOUS

PDF

38.7 KB Created: 2020-06-18 19:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-10
MD5: 8bb55445703c4db0fb7f1ce591c44a3c SHA-1: 8e159e00091869651a82db28009f32a41987bc91 SHA-256: ba4bd4093c9391a07bdd29689cca707742e40031c9c168d9af4e9724d39a7cbd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1599 Host Compromise T1204 User Execution

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on unrelated domains, suggesting a link farm or SEO manipulation tactic. The document body is heavily obfuscated but contains some of the same URLs, reinforcing the link farm nature of the document. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mx.evanstonrealtor.net/uploads/1/3/0/8/130814343/130814343.html#toyota+organizational+structure+pdf PDF link annotation
    • http://patternmylife.com/uploads/1/3/1/1/131164546/9d678bda82dee30.pdfIn PDF document text
    • http://sharonyoder.com/uploads/1/3/0/4/130476079/0946c9b4b501e.pdfIn PDF document text
    • http://74-123-75-189.mgwnet.com/uploads/1/3/1/4/131438418/9617498.pdfIn PDF document text
    • http://mx.elgaby.com/uploads/1/3/1/6/131636707/f2496bb978.pdfIn PDF document text
    • http://lunalilybotanicals.com/uploads/1/3/0/8/130814085/5217547.pdfIn PDF document text
    • http://danschulmanpedophile.com/uploads/1/3/0/4/130435805/gesil.pdfIn PDF document text
    • http://thesoonernetwork.com/uploads/1/3/0/5/130551839/fuwilaguga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x58DC 5308 bytes
SHA-256: ff9372b2935db27542cfb3f6acbf4aa4207ebee4ed2f7282202a5784625c7a32
font_01_sfnt_off00006b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B03 10604 bytes
SHA-256: a37a968fafcd9feb848e19e7af4fe36883183b7d4c3ac28b2b4e434516af260e

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