Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44ccbf558b7521a…

MALICIOUS

PDF

43.6 KB Authoring application: QPDF
MD5: c777e125446c59b6c6ab664fa8284694 SHA-1: 0220aa9b87c117a1c9924072d04deb54de093225 SHA-256: b44ccbf558b7521ac73c52a7d6b41cb22d013b33042a95f83b0c1a8415bf454d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or redirection scheme designed to distribute malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' further supports a phishing or traffic redirection intent. The embedded URLs are the primary IOCs for this attack.

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://northcountyhumanresources.com/uploads/1/3/0/5/130590391/budifesenigewiwetad.pdf
    • http://feset.sargar.ru/uploads/2020/01/28/1028885.pdf
    • http://zat.luciemauger.com/uploads/2020/01/28/6015488.pdf
    • https://fukefinelo.weebly.com/uploads/1/3/0/5/130551188/2019978.pdf
    • http://susitixet.bp-bas.com/uploads/2020/01/28/fixamiwutulago.pdf
    • http://wumo.vendasuaempresa.com/uploads/2020/01/29/roxixajavux-tiwimuvo-xisamol-pesesupobili.pdf
    • https://tezajelevikik.weebly.com/uploads/1/3/0/5/130550690/1957629.pdf
    • http://stripperbud.com/uploads/1/3/0/4/130476272/1544369.pdf
    • http://xixifizisa.rosstelekom.info/uploads/2020/01/29/be4de9b5735.pdf
    • http://vopub.remstroi-metal.ru/uploads/2020/01/29/lafubugisiluda_kozeporaladogop_wemewevibilunu.pdf
    • http://michaelshusko.com/uploads/1/3/0/5/130539287/130539287.html#how+to+use+ped+egg

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001274.bin
03e2ff9843d8ffbca3f8adda487db9a8001e215b8264a5149a44491010cd26f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1274 8108 bytes
font_01_sfnt_off00005d1a.bin
094359120818baad251b372eb0b1a3904e7059b25e94b8f19687b70a58d39ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1A 18344 bytes

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