Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3ec40684e858db…

MALICIOUS

PDF

60.3 KB Authoring application: LibreOffice Draw
MD5: a291292f251663d40df6bc4364c8a65c SHA-1: 8d26e05f440a1626c8664946189a1cf6c6ecb6a4 SHA-256: cd3ec40684e858db37abc52edf4ef7ef14d6d28efc533d87704b970aa4361072
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to external PDF documents hosted on various domains. This behavior, combined with the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', strongly suggests a phishing or malware distribution campaign. The document body itself appears to be corrupted or contains irrelevant text, but the primary malicious intent is derived from the link farm.

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://yardpick.com/uploads/1/3/0/5/130540282/lolexivakokev.pdf
    • http://pelledolce.net/uploads/1/3/0/8/130814121/wowexebotan.pdf
    • http://dealeydivision.us/uploads/1/3/0/5/130590672/7517995.pdf
    • http://sound-systems.net/uploads/1/3/0/5/130546209/9791892.pdf
    • http://ovbeyondtherainbow.org/uploads/1/3/0/7/130739167/2320998.pdf
    • http://muzoemeralds.net/uploads/1/3/0/7/130739539/nepodekobubaka.pdf
    • http://golfbravobravo.com/uploads/1/3/0/3/130379596/507a9e0405.pdf
    • http://chungsameducation.com/uploads/1/3/0/2/130272394/f40f79fc7acb3.pdf
    • http://central24h.com/uploads/1/3/0/5/130550684/xenegudekosub.pdf
    • http://hostmaster.liekeanna.com/uploads/1/3/0/2/130272083/fanejazalipis.pdf
    • http://christinabeautyparlour.com/uploads/1/3/0/6/130603932/130603932.html#cuidados+de+enfermeria+en+ni%C3%B1os+con+parasitosis+intestinal

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011c3.bin
a34e2d93b3f045721f870a05f3b2bd9c2675d9c125f34b8699bcb90f696301f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3 9852 bytes
font_01_sfnt_off0000b0f5.bin
19c5fce83e456a796e1368f43604ece917409e81de26a4c20f588591bb9f6cc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F5 1620 bytes

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