Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b425cb7a6e7cc6…

MALICIOUS

PDF

30.6 KB Created: 2020-04-06 07:53:01 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d6ba591b52d26408fdf0baaab2603af SHA-1: c4f04d31ef8c15594a00798e8de7c6f9779e544d SHA-256: c4b425cb7a6e7cc62c109a79c146042c6700cd34dfe6e940b48cf46bc8eb2308
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains a large number of external links to other PDF files hosted on various domains. This technique is commonly used for SEO poisoning or to distribute malware by redirecting users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://edrobinsonfamily.com/uploads/1/3/0/6/130622075/130622075.html#dr.+seuss+birthday+invitations
    • http://stevenamiller.com/uploads/1/3/0/5/130538941/senumebik.pdf
    • http://octoacademykids.com/uploads/1/3/0/5/130542894/gotamukumikiniliki.pdf
    • http://sycamore.world/uploads/1/3/0/7/130775472/1720393.pdf
    • http://americanbrickandlandscape.com/uploads/1/3/0/8/130873842/domiw.pdf
    • http://anisschleiblick.de/uploads/1/3/0/7/130775286/6cb9938f1cf36.pdf
    • http://artemdeev.pro/uploads/1/3/0/6/130621315/kisem.pdf
    • http://windsor-resources.com/uploads/1/3/0/6/130621208/xafoderikuraz.pdf
    • http://malanature.com/uploads/1/3/0/6/130620551/pusiwejitoto.pdf
    • http://newskinandcare.com/uploads/1/3/0/2/130287738/wunedusi-wukin-riwusuvavazeso.pdf
    • http://smbrandmgt.com/uploads/1/3/0/6/130640090/251912.pdf
    • http://janinelmdelany.com/uploads/1/3/0/4/130476471/bidikimameso_lolilelumasum.pdf
    • http://creativeagencylosangeles.com/uploads/1/3/0/6/130639254/bdca01a405381e8.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_off00005271.bin
83e51681ddf3b00d7d36c125cd4d2136f1f68f41bf1daf76afea3cee7d83c6a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5271 6772 bytes

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