Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c9d86dac3bd827f…

MALICIOUS

PDF

50.1 KB Authoring application: Mobipocket Creator
MD5: d45e1961c5c97b481a8fb0733bed38cd SHA-1: 3db6ca5ded545d62ec23b493c389966d3e23e9ba SHA-256: 5c9d86dac3bd827f7c2dfbb0d1eaf6484515454e7cbf0db1c65b22151634cdae
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs pointing to other PDF files hosted on various domains, indicative of a link farm or a distribution mechanism. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious content or to manipulate search engine rankings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://mhsclassof1976.com/uploads/1/3/0/5/130589397/858a9a.pdf
    • http://therockbridgeport.com/uploads/1/3/0/5/130539107/c31643fd31f8f.pdf
    • http://joeljimenezfashion.shop/uploads/1/3/0/5/130589072/7157985.pdf
    • http://ancienthand.net/uploads/1/3/0/5/130539759/wirasasutawi.pdf
    • http://eggphilly.us/uploads/1/3/0/5/130551049/labuzojitara.pdf
    • http://nonnibarn.com/uploads/1/3/0/2/130287503/megipinanun.pdf
    • http://mrserickagraham.org/uploads/1/3/0/6/130621776/lixukiluv.pdf
    • http://thehappygirlstore.com/uploads/1/3/0/5/130551402/130551402.html#site+to++mac+games

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001133.bin
e2bcf2ba1791b6a5ce828085c50f142241669ec79f5e6f06424c639499fd3e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1133 8712 bytes

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