Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bf2839d6ba2e96…

MALICIOUS

PDF

38.6 KB Created: 2020-04-17 01:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4594c63c4c26557470096bbbf7309a0 SHA-1: 1d8636ed0b449ddac1ed3e3c7b405fee5ba74a5f SHA-256: 28bf2839d6ba2e968f7012da1d1ce71f83ea0fd2d5f444d695b63578c775702e
96 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 domains designed to appear as legitimate content repositories. The document body, though heavily obfuscated, contains text related to 'play piano sheet music' and 'fortnite', suggesting a lure to attract users to click on the embedded links. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm, a common technique for SEO poisoning or distributing malicious content.

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://gradlauncher.com/uploads/1/3/0/5/130589401/130589401.html#play+piano+sheet+music+fortnite+pleasant+park
    • http://yibcl.com/uploads/1/3/0/5/130543261/4039774.pdf
    • http://justgay.info/uploads/1/3/0/5/130539756/9747895.pdf
    • http://bytheinchitsacinch.com/uploads/1/3/0/5/130589261/mureminasoliv_sowode.pdf
    • http://stillwatermassage.org/uploads/1/3/0/8/130813796/gujaf.pdf
    • http://thecinart.com/uploads/1/3/0/5/130588650/9e5689ad00ec51.pdf
    • http://campoutiowa.com/uploads/1/3/0/8/130874292/7069731.pdf
    • http://woodlandelementarycoachhughes.com/uploads/1/3/0/6/130621732/886214.pdf
    • http://collegecredittutorial.com/uploads/1/3/0/4/130489075/3001802.pdf
    • http://trailerrepairrichmond.com/uploads/1/3/0/7/130739396/986a0f610e1524.pdf
    • http://celebrationinajar.com/uploads/1/3/1/3/131380729/negos.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e96.bin
d056482ce418ca04d2df57c5c266ed5d5bb3d1b888d5aaa4f290f539a1f673a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E96 8092 bytes

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