Malicious PDF — malware analysis report

Static analysis result for SHA-256 8828b83c1f61eef3…

MALICIOUS

PDF

35.4 KB Created: 2020-06-22 04:48:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2806c463fe836047958c65f3ef18cb8 SHA-1: e69cf111479205e1811b36c0285dc177439fcd5c SHA-256: 8828b83c1f61eef376fe4d3bce4f12d74c8bb8a5ff409783c761c5f3a37f0e0c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. No scripts were extracted, but the sheer volume and nature of the embedded URLs suggest a malicious intent to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://buildingblocksforlife.net/uploads/1/3/0/6/130603682/130603682.html#insert+a+photo+into+a+pdf
    • http://3pw.undesirable.us/uploads/1/3/1/6/131636977/5778637.pdf
    • http://ch.breakthroughtc.com/uploads/1/3/1/4/131438461/ea65435cce.pdf
    • http://carsonsphotos.com/uploads/1/3/0/2/130291371/1080481.pdf
    • http://routestoknowledge.com/uploads/1/3/1/0/131070792/pakesegukakan.pdf
    • http://vrmuth.com/uploads/1/3/0/6/130621294/fbef9c0953.pdf
    • http://mcctorg.org/uploads/1/3/1/3/131398268/3894774.pdf
    • http://mail.dolphinvacations.net/uploads/1/3/0/7/130776260/linuwexizaxu.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_off00004da1.bin
0a4c08ff4c4577b2df1507c78a91a7b191040d3bee785066798775d180af8f63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA1 4820 bytes
font_01_sfnt_off00005de8.bin
b844b176e5322c42629dcb8c4dc6e6fb5b6f07e3a3f8f861260903e7de5c93bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE8 10628 bytes

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