Malicious PDF — malware analysis report

Static analysis result for SHA-256 85463a7c857da5d7…

MALICIOUS

PDF

42.7 KB Created: 2020-03-30 12:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1061fa1ba66367e7329528ad81889e83 SHA-1: 38cc6f643c70fc919ab11274f7422c853a75c1b5 SHA-256: 85463a7c857da5d74a74f612e540acc9481972953c59cc1d8a9c3b3e4bb3d987
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, many of which point to similarly structured URLs on different domains. This suggests a link farm or redirection scheme designed to lead users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact nature of the lure beyond the presence of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://bsa-sccc-pack301.com/uploads/1/3/0/4/130476981/130476981.html#ecuaciones+de+lanzamiento+vertical+y+caida+libre
    • http://vancouvervideopro.com/uploads/1/3/0/8/130874554/2b45181ed34.pdf
    • http://grace215.org/uploads/1/3/0/2/130272474/7005671.pdf
    • http://green-elephant-trading.com/uploads/1/3/1/3/131384175/figij_navutefo_supigez.pdf
    • http://almiraosmanovicthunstrom.com/uploads/1/3/0/7/130775503/kezev.pdf
    • http://fcaky.com/uploads/1/3/1/3/131398479/fubededif.pdf
    • http://whistletags.com/uploads/1/3/0/9/130969358/1210142.pdf
    • http://legitedit.com/uploads/1/3/0/5/130588230/mudibi.pdf
    • http://trademaxinc.com/uploads/1/3/0/6/130621719/8713373.pdf
    • http://pdinternational.net/uploads/1/3/0/7/130739508/9301515.pdf
    • http://partyriesling.com/uploads/1/3/0/6/130604799/95d2e0917b1cb32.pdf
    • http://glenlakefinancing.com/uploads/1/3/0/4/130477131/7068951.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_off00006774.bin
9883193b103a27380277a717db62f9d0cf2a9118b0f9f754fe4b5aa536eb9b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6774 8436 bytes
font_01_sfnt_off00008666.bin
65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8666 16096 bytes

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