Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b88f2e00f7a0e74…

MALICIOUS

PDF

35.8 KB Created: 2020-06-02 21:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 261a52264d8a3a75440ff1b8eb38a0a6 SHA-1: 814e3c258903384eadc75c49f57ce1eefbbade8e SHA-256: 8b88f2e00f7a0e745b488c9f4aedee5659faac9c460844b36995fb3b496c67b3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents hosted across various domains. The ML classifier strongly indicated maliciousness. The primary purpose appears to be redirecting users to a network of SEO-optimized content, likely to distribute further malware or engage in phishing activities. No scripts were extracted, and the document body contained mostly garbled text and the identified URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://rencai.bpmtc.com/uploads/1/3/0/3/130323811/130323811.html#inversion+table+use+guidelines
    • http://electricianshampton.com/uploads/1/3/1/4/131453735/36908.pdf
    • http://hostmaster.kieran-madden.com/uploads/1/3/0/5/130551065/450e93e7.pdf
    • http://hub83.com/uploads/1/3/0/3/130324037/2628774.pdf
    • http://twf.agency/uploads/1/3/0/4/130435631/segeluk_xodoredojo_mowugatedajo.pdf
    • http://gracefoundationnj.org/uploads/1/3/0/6/130604872/1696979.pdf
    • http://rencai.bpmtc.com/uploads/1/3/0/3/130323811/terms.html
    • http://rencai.bpmtc.com/uploads/1/3/0/3/130323811/dmca.html
    • http://rencai.bpmtc.com/uploads/1/3/0/3/130323811/policy.html
    • https://gesefurexele.files.wordpress.com/2020/06/mizulapukixaleru.pdf
    • https://jupeveni.files.wordpress.com/2020/05/muporifosifare.pdf
    • https://gavadopojame.files.wordpress.com/2020/05/66387850436.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_off0000615d.bin
5fc6369d3c9ebc5319641750fbd60bd2a4d26d1a9b453063e04f81d88fbf6e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615D 10108 bytes

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