Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdddaa552b16bd1…

MALICIOUS

PDF

52.6 KB Authoring application: Pdftk
MD5: 06f14ffdb5c7dd7d7b731638c9f8fd08 SHA-1: a3c8601649e312a50d822572643e68e45f96ce4d SHA-256: 4cdddaa552b16bd1c814726b28a9923b3d1d1da1da90070a5edaaa5234734e45
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The primary indicator is a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to phishing or malware distribution sites. The ClamAV detection name 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further suggests a phishing or traffic redirection intent. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://natalieeldridge.com/uploads/1/3/0/5/130589400/zulopu.pdf
    • http://nnetherland.com/uploads/1/3/0/4/130436028/pazimanisex.pdf
    • http://ginandtarnish.com/uploads/1/3/0/4/130488195/2544253.pdf
    • http://siroz.z-kiski.fun/uploads/2020/01/28/3220430.pdf
    • http://naturallearningenterprises.weebly.com/uploads/1/3/0/3/130313013/6972789.pdf
    • http://ahoconline.com/uploads/1/3/0/3/130379612/44782.pdf
    • http://pak.88ground.com/uploads/2020/01/28/vukinozimokus.pdf
    • http://arceasternpanhanlde.org/uploads/1/3/0/4/130488889/ladokojogivadagenub.pdf
    • http://e2bioconsults.com/uploads/1/3/0/5/130538831/kotadixenem.pdf
    • http://6000hudson.com/uploads/1/3/0/5/130551135/1b81d02.pdf
    • http://mustardseedboutiquemass.com/uploads/1/3/0/6/130621127/sowaji.pdf
    • http://ludep.sendfrs.com/uploads/2020/01/28/virubijiboxubikiju.pdf
    • http://newperspectivemedical.com/uploads/1/3/0/6/130621141/130621141.html#la+dama+del+alba+act+1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001300.bin
7d8697c6ccbeb0aa6a15d1f67a8166c2416bd2d69bed9d717f7b036f3d6308d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300 9452 bytes
font_01_sfnt_off000086e8.bin
5d7ebd720715cd86529581f1d40cc643f68465477bd430d4be5ff736bc95f798		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E8 16268 bytes

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