Malicious PDF — malware analysis report

Static analysis result for SHA-256 2981fe9c040bb9f3…

MALICIOUS

PDF

39.1 KB Authoring application: Pdftk
MD5: f2d3d9e5668f969462dd2f40394515ca SHA-1: 281c3048146ff04ae7d9748c29e71fd1e8debe52 SHA-256: 2981fe9c040bb9f3e95064db837670b8c743059724d96e9a1eac65e849d42d4c
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified by the PDF_SEO_LINK_FARM heuristic, which are likely used to redirect users to malicious sites. The ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall' and the ML classifier's high confidence score further support a malicious classification. The document body, though heavily obfuscated, contains text that appears to be a lure for educational content, specifically multiplication worksheets, to trick users into clicking the malicious links.

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://wesous.com/uploads/1/3/0/6/130621363/topabiluje.pdf
    • http://makeyourmark.shop/uploads/1/3/0/7/130738657/8192314.pdf
    • http://www.brittanycardoza.com/uploads/1/3/0/6/130603909/ledaxasi_nifuzadimo.pdf
    • http://sweethomealamama.com/uploads/1/3/0/2/130287817/6178069.pdf
    • http://jenleighdesign.com/uploads/1/3/0/4/130475989/34fda76.pdf
    • http://www.prowl.tv/uploads/1/3/0/6/130603942/sagudoporeliki_nigagebivodub_rikekezibipi.pdf
    • http://www.3drapidengineering.com/uploads/1/3/0/7/130739695/3241604.pdf
    • http://hollybabiarz.com/uploads/1/3/0/2/130271013/e34e4.pdf
    • http://jamesbrown4judge.com/uploads/1/3/0/8/130873949/rabotinitolutu_vujelejixerili.pdf
    • http://artshotz.com/uploads/1/3/0/7/130739719/gasudaxerogudo_kilumidosoti_dedobud_fizogidevun.pdf
    • http://333tools.com/uploads/1/3/0/7/130740055/a2380d1.pdf
    • http://theamazingdrunk.com/uploads/1/3/0/7/130776875/kenerufegife.pdf
    • http://soundlord.com/uploads/1/3/0/5/130541186/goluw-mulizule.pdf
    • http://71-159-221-59.overtimefitness.com/uploads/1/3/0/6/130604195/130604195.html#fourth+grade+multiplication+worksheets+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000033f9.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x33F9 2652 bytes
font_01_sfnt_off00003fd3.bin
c03c2b36ab26cfb9c4fd4677c3b8c8798adee9dc7e9d59536155354d3925ad03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3FD3 7944 bytes

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