Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b6361bdb584b2af…

MALICIOUS

PDF

31.4 KB Created: 2020-05-30 01:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 5c70cd369f31bb157b3e45dfa48ac1e4 SHA-1: edd7731f6376bb27399e2387a3f127d32d9d34e7 SHA-256: 3b6361bdb584b2aff6b59fb8334922d0ab561a8ca4310f116e80cc8057d74acc
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it is part of a link farm designed to attract traffic. Multiple external URLs were extracted, pointing to various PDF documents hosted on different domains. The document body, though heavily obfuscated, also contains some of these URLs, reinforcing the link farm tactic. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9870

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://hepburnhideaway.com/uploads/1/3/0/6/130620321/130620321.html#linea+azul+gnp PDF link annotation
    • http://glasshousecafemq.com/uploads/1/3/1/4/131437640/golej.pdfIn PDF document text
    • http://mta-sts.mail.coaptcontrol.com/uploads/1/3/0/6/130603725/a017a2ce50b2.pdfIn PDF document text
    • http://jasonliebsonmusic.com/uploads/1/3/0/4/130488829/6f26de568.pdfIn PDF document text
    • http://rehobothgirl.com/uploads/1/3/0/5/130543141/87271c.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 2

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EC8 10960 bytes
SHA-256: 31023ab32fbb82d32dd3904f85f0d487f58fcc89e1cc66f40998c53eaf75aaa4

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